I'm looking to optimize my fab setup, feel like sharing your fabfile.py?

Same here, except I've set things up so that any changes I make to my project are automatically synced instantly to a live staging domain, and I don't have a revert command (although I do back up copies of previous deployments). I also keep apt and pypi dependencies in project-local config files and have a refresh command that updates those packages on both the remote and local machine along with some other stuff. I think I might have overengineered things a little.