Will I be better of waiting on GemRB than trying to force poor old PST to do this ? Heh, the more I hear about the PST engine itself, the more it sounds like one heck of an ugly hack.
Well, since I'm not programming guru myself, I can't really say for certain. Though it would surprise me if you couldn't tweak some flags to tell what class TNO counts as at any given time, considering how weird his class setup is to begin with.
If so, then you could technically force the flag to F/M/T and thus enable all options right away. Would also have made a few things less bothersome on repeated playthrough, since you wouldn't have to keep bouncing back and forth between classes for things all the time.
I agree that a F/M/T would probably be the most logical variant, and I've been wanting to try just that for years. Simply because I'm so tired of TNO's wacko-dualclassing. But I've also wanted to try to play all the other classes; Unfortunately Ranger, Paladin, Bard and Druid are not implemented in the engine/game, so can't try those (One point for eventually trying this out in GemRB, as you could import the classes from the other games). But Cleric or Fighter/Cleric would also be fun, and old favorites of mine. And if the game just could "recognize" a cleric as a mage, then you would still get enough dialogue options to satisfy I guess.
But anyways, I don't expect anything like Qwinn spending a year rewriting all scripts and text to allow for all kinds of class and multi-class options etc. I'd be fine with just playing TNO as any new class or class-combinations, even if I lost lots of dialogue on it etc, aka no class dialogue.
Should also mention that I absolutely hate playing pure class fighter, thief or mage. They are the three most boring classes for me which probably have something to do with my strong opinion on this. Love those classes when multi classed, but not stand alone. I think TNO would have made an awesome bard! (Essentially a F/M/T in one package), and I'm having a good laugh every time I try to imagine TNO as a Druid, or heck any druid in Sigil.