I'd love this as well, but as it's a clipping nightmare, it's probably pretty hard to do.. We want that, but we want to see weapons sheathed and bows/shields slung on our backs, so I think it's one of those things that get dubbed "impractical" early on... though I definitely agree with your sentiment. It'd be lovely to have.
I remember the original NWN having a mod that put them in.. they weren't great, but they were nice..
