I'm actually working on a mod for this. It's nearly complete, but I'm working on making it compatible with other mods and bug testing it, so it's taken a little bit longer to finally release.

Barter isn't featured in the screenshots here, but the way I have it working currently is the vendor will recognize your party's highest barter skill as the barter skill for each character.

Screenshots:
[Linked Image][Linked Image][Linked Image]

LaughingLeader's DOS2 Mods