Oh yeah, I want to separate the city of Baldur's gate as an asset - clean out most of the quests and reconfigure it as a persistent Hub with shops and then expand it into a set of campaigns that the hub acts as a jumping off point for.
I'd probably make it so you couldn't actually kill anyone in Baldur's gate the city, only knock them out for a bit and then they respawn with full health. Or maybe just in the bars.
I'd like to have an Arena or a series of Arenas for 1 v 1 and 4 v 4 combat that you can que up for fights for and other people can bet on and watch.
I'd like to re-make The Keep on the Borderlands as an optional dungeon crawl adventure with all factions in play.
I'd also like to re-make Temple of Elemental Evil - although in Faerun instead of Greyhawke - it's another small self-contained dungeon crawl-esque adventure.
[list]
[*]Remaking Ultima 7's Trinsic in BG3's engine.]
I loved U7 - Trinsic re-make sounds awesome.