the issue is a code one and the fact characters keep their gear when they die = making a 'camp' everything buttion would bug out... not that i assume thats why Larian hasn't done it , just saying the way their code works would give that result
having a way to swap items between characters at camp is what most people want and the block there is multiplayer i.e, lag but that is simple enough to work around and i would assume mods after release if Larian doesn't do it them selves
Ah, man. I'd settle for clicking a character and opening a sort of trading window.