I'm would like to now if the multiclass options are overriden by some mod out there, or if there is a project adressing this limitation.
As I recall, they are hard coded, but that does not remove the possibility entirely.
(I'am aware of the GemRB project, and I'm intrested in options for the original infinity engine/BG2, particulary for mega mod installations.)
I'we wanted to play a multiclassed wild mage/figher since the first ToB trailer surfaced.

Just imagine:
*casts Nahal's Reckless Dweomer*
*tries to form fireball on an enemy*
*target becomes discolored*
*Caster: Oh well, I might just as well cut him down.*
*casts improved invisibility and improved haste*
*charges into battle*

(I know dual classing, i tried it but it is just not the same.)
It would be overpowered, that is for sure, but that issue can be dealt with, using the tactics mods, or the xp nerfer.
Anyone with some suggestrions/answers?