Mod request: stay in SoA after the final battle, choose when to start ToB

The game automatically starts ToB after you end the final confrontation of SoA. However, I would like to continue to mess around in Amn before going into ToB. Thus it would be available with some sort of character dialogue, like how the transition between BG1 and BG2 was managed in BGT before SoD.
My request is mainly for role-playing reasons:

1) Can't think of a better time for doing the Watcher's Keep, as there are more urgent questions to be solved during ToB, and it is unbalanced for SoA. First levels give you too much XP, money and good gear making SoA trivial, last levels could be too hard during chapter 2 (I don't like leaving quests half-completed for a while and during chapter 6 I don't want to detour from the very urgent main quest just for seeking treasures elsewhere);
2) Even if I usually complete all side quests during chapter 2, some players might still leave some of them because they think that it would take too much time when you are in a hurry for Imoen and you had enough money since weeks;
3) Plot states that CHARNAME spent some time in Suldanesselar before the other Bhaalspawns started to annoy people in ToB and everybody noticed their fuss, but in-game the transition is instantaneous.

Thank you!