The graphical user interface actually just connects to a port on your local computer and sends commands to the tor program when you click on stuff. You could set up a hotkey to run a little script that does the same thing Vidalia (the graphical interface) does. But it's got authentication that's random by default, I think, so you'd either have to disable authentication or automatically determine the password Vidalia generates or something. A lot harder than a quick and easy command or something.Other than that, I don't think there's any way to do it.