I'm using the Big World project mod and part of it is Tutu (I think) that makes BG1 and BG2 a single, continuous game.
Will I be able to go back to the old BG1 areas and complete quests there after I speak to the guy after killing Sarevok to start the Shadows of Amn part of the game? Or will I be unable to return to those areas once I start BG2?
Nope Tutu here, it's actually the antithesy of Tutu- BGT, that makes the two games work in the same game.
Well, the final time you speak to Belt, you will be sent to Amn(and the Irenicus Dungeon) and you won't be able to travel back to the BG1 areas, ever.
Yep, Jarno Mikkola. my Mega Mod FAQ. Use of the BWS, and how to use it(scroll down that post a bit).
OK, desert dweller, welcome to the sanity, you are free to search for the limit, it's out there, we drew it in the sand. Ouh, actually it was still snow then.. but anyways.