it would be relatively easy (and I'd be surprised if someone hadn't scripted it to make it easier) to have a set of project specific configs which you merge int

it would be relatively easy (and I'd be surprised if someone hadn't scripted it to make it easier) to have a set of project specific configs which you merge into your global configs and exec a subshell per project. If you did it inside screen/tmux then you'd be able to switch between them easily as well. The main issue I have with discriminating shells like this is that I tend to have a whole bunch open, and use the first I find that isn't already doing something useful. This means a lot of the time it's using features that technically 'belong' to a different project.