Valheru posted an idea at FW about the PC being able to fully join the Cowled Wizards if he`s a mage and I remembered that I was tossing around similar ideas myself years ago. Let me quote:
The idea is intriguing and I thought of this too a while ago; it would be nice to be able to actually join the Cowled Wizards in a more developed way than it was done in vanilla BG2.
It is well known that the whole organization of the Cowled ones is a pit full of corruption and whatnot; perhaps as a good-aligned player, by gaining higher and higher ranks within the organization itself, could try to combat all these negative aspects and maybe gain control of a portion of it. I`m not saying he should automatically become a member of the Council heh, but gain a title which would allow him to control a certain part which is under the tutelage of the organization (gaining the Asylum as a stronghold, perhaps?).
I think the Asylum would be a good stronghold, perhaps the player should get an innate which would allow him to teleport back to the stronghold regardless of where he currently is, much like the Stone of Recall from Neverwinter Nights. Aye, balance issues might arise, but it`s rather reasonable, perhaps disallowing the player to exit the asylum in any other way than using the aforementioned innate would resolve everything.
Apologies for the long post, but what do you guys think about something like this? As Cam pointed out, a quest mod should be pretty well received by the masses (provided it`s well done, that is).