This situation has improved a lot within the last year. I'd highly recommend trying out a combination of a-Shell (includes vim!), and WorkingCopy for git. Both

This situation has improved a lot within the last year. I'd highly recommend trying out a combination of a-Shell (includes vim!), and WorkingCopy for git. Both of these can access any folder in Files or any external file provider (even outside of their sandbox). SecureShellFish is also great if you want to interface with a server.