I was thinking it would be great if they did with Baldur's Gate what Bioware did with Mass Effect.
Whoa whoa hear me out for a second!

With the BG series you get to import your main character from the first to the second game, letting you hold on to your character's level and chosen skills. But your companions from the first game don't get their stats carried over and none of the quest choices you make have any effect on the second game. Most of this makes sense because the second game takes place at a different location, but there are several occassions where you run into characters from BG1 that you could've killed in a quest. These can be potential companions but also other minor characters.
From what I remember Bioware's solution for recurring characters was to add a dialogue option that basically says 'Hello friendly looking guy!' 'Hey, didn't I kill you before?' 'Oh yeah that's right! I got better. Now I'm going to kill you' which would trigger a fight.
I'd rather see that NPCs killed in BG1 stay dead. I don't think there's a single person in the first game besides Imoen who plays an essential role in the second game. There's Minsc and Jaheira who you meet right away, but you can just leave them in the starting area. I also think companions should also keep the skills/experience from the first game, except maybe Imoen who learned some magic.
It shouldn't be that much work either. Unlike with more recent Bioware games, none of the BG companions except Imoen in BG2 are essential at any point. You can kill them, leave them behind, or never pick them up.