While installing Drizz't Saga I noticed it gave a warning about a script block not being upgraded, namely the ARAM00.bcs script. Drizz't Saga tries to change Imoen's block in order to make Drizz't Saga characters leave the party and disappear upon transition between BG1 and BG2.
In the tp2 the relevant piece of code is:
COPY_EXISTING ~ARAM00.BCS~ ~override~ REPLACE_BCS_BLOCK ~oARAM00.BCS~ ~nARAM00.bcs~ BUT_ONLY_IF_IT_CHANGESbut the block as written in oARAM00.BCS won't be found in ARAM00.BCS
It's an harmless warning since its only consequence will be (I guess) that Drizz't Saga characters will still be in the party at the start of BG2, or will be handled by the standard ARAM00.bcs.
I'm sorry if I've chosen the wrong board, but since I tried the mod specifically modified for BGT I think that's the right place. If not, please point me towards the right place and I'll notify the warning there too.