As far as I know, there is not any scripting that can be done to allow custom domains on character creation without first going in game and talking to a LETO editing NPC, but you -can- have custom domains and have deity specific domains, one issue with NWNs domains is there just aren't enough of them to limit chars to having to use both domains of a deity, if you're prepared for the scripting job of it all, you would need to about double the number of base domains offered or more:
Bioware Domains:
Air
Special Ability: As default
Spells: 1 - Expeditious Retreat, 3 - Call Lightning, 5 - Gust of Wind, 6 - Chain Lightning
Animal
Special Ability: Uses Druid summons instead
Spells: As default
Death
Special Ability: As default
Spells: 3 - Negative Energy Burst, 4 - Phantasmal Killer, 5 - Enervation
Destruction
Special Ability: As default
Spells: 3 - Stinking Cloud, 6 - Acid Fog, 8 - Implosion
Earth
Special Ability: As default
Spells: 4 - Stoneskin, 5 - Energy Buffer, 6 - Greater Stoneskin, 7 - Stone to Flesh, 8 - Flesh to Stone
Evil
Special Ability: As default
Spells: 1 - Negative Energy Ray, 3 - Negative Energy Burst, 5 - Enervation, 8 - Energy Drain
Fire
Special Ability: As default
Spells: 3 - Fireball, 4 - Wall of Fire, 5 - Energy Buffer, 6 - Elemental Shield, 8 - Delayed Blast Fireball
Good
Special Ability: As default
Spells: 4 - Stoneskin, 5 - Lesser Planar Binding, 6 - Planar Binding, 8 - Greater Planar Binding
Healing
Special Ability: As default
Spells: 2 - Cure Serious Wounds, 5 - Heal, 6 - Mass Heal
Knowledge
Special Ability: As default
Spells: 1 - Identify, 2 - Knock, 3 - Clairaudience/Clairvoyance, 4 - True Seeing, 6 - Legend Lore, 8 - Premonition
Magic
Special Ability: As default
Spells: 1 - Mage Armor, 2- Melf's Acid Arrow, 3 - Negative Energy Burst, 4 - Stoneskin, 5 - Ice Storm, 6 - Lesser Spell Mantle
Plant
Special Ability: As default
Spells: As default
Protection
Special Ability: As default
Spells: 1 - Shield, 4 - Minor Globe of Invulnerability, 5 - Energy Buffer, 7 - Protection from Spells
Strength
Special Ability: As default
Spells: As default
Sun
Special Ability: As default
Spells: 2 - Searing Light, 7 - Sunbeam, 8 - Sunburst
Travel
Special Ability: As default
Spells: As default
Trickery
Special Ability: As default
Spells: As default
War
Special Ability: As default
Spells: As default
Water
Special Ability: As default
Spells: 1 - Grease, 3 - Poison, 5 - Ice Storm, 6 - Drown
Server-Specific Domains:
Balance
Special Ability: Divine wisdom - The cleric gains a bonus to wisdom equal to 2 + 1 per 3 cleric levels. The effect lasts for 5 rounds + the cleric's charisma modifier.
Spells: 2 - Clarity, 4 - Dismissal, 5 - Greater Sanctuary, 8 - Protection from Spells
Cavern
Special Ability: Bonus Feat - Darkvision
Spells: 2 - Darkness, 6 - Stonehold, 7 - Earthquake
Chaos
Special Ability: Turn Outsiders
Spells: 2 - Magic Circle against Alignment, 4 - Confusion, 6 - Word of Faith
Charm
Special Ability: Bewitching Glibness - The cleric gains a bonus to Persuade and Bluff equal to 1 + 1 per 5 cleric levels. The effect lasts for 5 turns + the cleric's charisma modifier.
Spells: 2 - Aura of Glory, 8 - Mass Charm, 9 - Dominate Monster
Cold
Special Ability: Turn Elementals
Spells: 1 - Ice Dagger, 4 - Ice Storm, 6 - Cone of Cold
Community
Special Ability: Bonus Feat - Skill Focus: Persuade
Spells: 1 - Aid, 2 - Prayer, 7 - Mass Heal, 8 - Protection from Spells
Courage
Special Ability: Valor of Lions - The cleric gains immunity to fear. The effect lasts for 5 turns + the cleric's charisma modifier.
Spells: 2 - Prayer, 3 - Divine Power
Craft
Special Ability: Artisan's Mastery - The cleric gains a bonus to Craft Armor and Craft Weapon equal to 1 + 1 per 5 cleric levels. The effect lasts for 5 turns + the cleric's charisma modifier.
Spells: 1 - Fox's Cunning, 7 - Crumble, 9 - Blackstaff
Darkness
Special Ability: Shrouds of Shade - The cleric may cast a version of Darkness that lasts equal to 5 turns + the cleric's charisma modifier.
Spells: 1 - Darkness, 8 - Mass Blindness/Deafness
Dragon
Special Ability: Bonus Feat - Skill Focus: Intimidate
Spells: 3 - True Seeing, 6 - Stoneskin, 9 - Shapechange
Dream
Special Ability: Braver of Nightmares - The cleric gains immunity to fear. The effect lasts for 5 turns + the cleric's charisma modifier.
Spells: 1 - Sleep, 4 - Phantasmal Killer, 8 - Power Word: Stun, 9 - Weird
Drow
Special Ability: Bonus Feat - Resist Poison
Spells: 2 - Clairaudience/Clairvoyance, 6 - Greater Dispel, 8 - Greater Planar Binding
Dwarf
Special Ability: Bonus Feat - Bullheaded
Spells: 1 - Ironguts, 4 - Stoneskin, 6 - Stonehold
Elf
Special Ability: Bonus Feat - Alertness
Spells: 2 - Cat's Grace, 3 - Clairaudience/Clairvoyance, 4 - One with the Land
Fate
Special Ability: Fickle Strands of Fate - The cleric randomly gains from +3 AB/Divine Damage to -2 AB/Divine Damage. No matter if bonus or penalty, the effect lasts for 5 rounds + the cleric's charisma modifier.
Spells: 7 - Premonition, 8 - Mindblank
Gnome
Special Ability: All Invisiblity-like spells are cast as Extended
Spells: 1 - Fox's Cunning, 2 - Invisibility, 3 - Camouflage, 4 - Invisiblity Sphere
Halfling
Special Ability: Trickery Domain power
Spells: 1 - Camouflage, 2 - One with the Land, 3 - Mass Camouflage
Hatred
Special Ability: Seething Assault - The cleric gains a divine bonus to damage equal to 2 + 1 per 5 cleric levels. The effect lasts for 5 rounds + the cleric's charisma modifier.
Spells: 4 - Fear, 9 - Wail of the Banshee
Illusion
Special Ability: All Invisibility-like spells are cast as Extended
Spells: 2 - Invisibility, 3 - Invisiblity Sphere, 4 - Displacement, 9 - Weird
Law
Special Ability: Turn Outsiders
Spells: 2 - Magic Circle against Alignment, 5 - Hold Monster, 6 - Word of Faith
Luck
Special Ability: Fortune's Wheel - The cleric randomly gains from +3 AB/Divine Damage to -2 AB/Divine Damage. No matter if bonus or penalty, the effect lasts for 5 rounds + the cleric's charisma modifier.
Spells: 1 - Aid, 3 - Freedom of Movement, 6 - Lesser Spell Mantle
Moon
Special Ability: Turn Shapechangers
Spells: 1 - Ultravision, 2 - Darkfire, 4 - Fear
Nobility
Special Ability: Noble's March - The cleric is able to inspire allies (but not themselves), giving them a morale bonus of 1 + 1 per 10 cleric levels to attack rolls, ability scores, saving throws and skill checks. The effect lasts for 5 rounds + the cleric's charisma modifier.
Spells: 2 - Magic Vestment, 8 - Storm of Vengeance
Orc
Special Ability: Strength Domain power
Spells: 2 - Blood Frenzy, 3 - Divine Power
Portal
Special Ability: Master of Boundaries - +2 CL for determining Gate power
Spells: 5 - Banishment, 8 - Gate
Renewal
Special Ability: Rapid Regrowth - The cleric gains a bonus to regeneration equal to 2 + 1 per 5 cleric levels. The effect lasts for 5 rounds + the cleric's charisma modifier.
Spells: 1 - Lesser Restoration, 3 - Restoration, 6 - Greater Restoration
Repose
Special Ability: Death Domain powers (always Outsider)
Spells: 4 - Bless Weapon, 5 - Undeath to Death
Retribution
Special Ability: Swift Vengeance - The cleric gains a damage shield that inflicts divine damage equal to 1d10 + 1 per 3 cleric levels. The effect lasts for 5 rounds + the cleric's charisma modifier.
Spells: 2 - Death Armor, 5 - Banishment, 6 - Lesser Spell Mantle
Rune
Special Ability: Bonus Feat - Scribe Scroll
Spells: 2 - Glyph of Warding, 5 - Lesser Planar Binding, 6 - Legend Lore
Scalykind
Special Ability: Turn Reptilians
Spells: 1 - Ironguts, 4 - Poison, 7 - Creeping Doom
Slime
Special Ability: Bonus Feat - Resist Energy: Acid
Spells: 1 - Grease, 2 - Melf's Acid Arrow, 5 - Evard's Black Tentacles, 8 - Power Word: Stun
Spell
Special Ability: Bonus Feat - Skill Focus: Spellcraft
Spells: 1 - Mage Armor, 2 - Magic Missile, 4 - Isaac's Lesser Missile Storm, 6 - Lesser Spell Mantle
Suffering
Special Ability: All Inflict spells are cast as if automatically Empowered
Spells: 2 - Inflict Serious Wounds, 5 - Harm, 8 - Horrid Wilting
Time
Special Ability: Bonus Feat - Improved Initiative
Spells: 5 - Haste, 7 - Legend Lore
Trade
Special Ability: Bonus Feat - Skill Focus: Appraise
Spells: 1 - Fox's Cunning, 2 - Identify, 8 - Mind Blank
Tyranny
Special Ability: All Domination-like spells are cast as Extended
Spells: 4 - Fear, 5 - Dominate Person, 8 - Power Word: Stun
Undeath
Special Ability: Sun Domain power
Spells: 2 - Animate Dead, 5 - Create Undead, 7 - Control Undead
// I won't list the server name in this as I consider it poor form to advertise or mention other servers by name on one server's forums. PnP games played through NWN hosting, like Valikar's or other such games are one thing.