Wow! This sounds like a honey for my ears

I have also got some additional suggestions:
- at first, you should enhance old NS/Twist components, especially Darkfriend kit. It's just weak - you gain 3 spells, and loose all normal shapechanging! My proposition is:
DARKFRIEND: ...
Sphere access:
- Major: all, monsters, elemental (all), plants, sun, weather
Advantages:
- At 7th level can once per day shapechange into Giant spider, Ogre and Troll
- Gain bonus Monster sphere, which allows him to cast: Summon monster I, II, III, Hold Monster, Summon Carrion Crawler, Spider Spawn, Beast Claws.
- At 15th level gain immunity to poisons and hold/paralyse effects
- At 17th, 19th and 21th levels he gains +10% immunity to acid
Disadvantages:
- Lose access to animal sphere
- Lose normal shapechange
- Lose druid abilities like a elemental immunities etc.
- Next thing is that armour which you gain when capture Shadow dragon. It's overpowered... +3 enchament with his bonuses will be great

- I think the first quest which you can have from your master will be remove this odd and stupid guard at outdoor of Circus. You know, he's still staying there and waiting for miracle

And you have got two resons:
a) Kill him on street. But he will shout and you have got troubles.
b) Make guard to go to circus and die. It's better idea.
- Next thing which is irrating in BG2 - when your reputation lower to 1, everyone are enemies and you loose one area for quests/dialogues etc. You can make neat-cheat to remove possibility to gain 1 reputation from standard, non-quest evil deeds like a pickpocket or kill someone

- Can you create possiblity of sacrfice Aerie for devils/demons? It will give you possibility of summon devil/demon which can give you something:
* effects like a Wish spell at highest wisdom/inteligence/level scores
* powerful, EVIL, magical item
* Dark Speech arcana (for evil bards)
* Dark spells
* powerfull demon who will serve you for some time (maybe it's a NPC idea?)
If you want, I can help you, because I have got many PnP materials (especially Book of Vile Darkness will be useful). And also I can post here some of my evil kits

Cheers,
Yarp.
PS. And one thing - Morrow Gate slowly rulz.
