I think the script should be given a simple GUI, packaged and then see what feedback it gets. I've been wanting something like this since I got my n900 back in November. For me 3g eats up way too much battery life and if I forget to turn it off I find myself without a phone when I most need it.

Many thanks to azstunt for getting the bulk of the work done and to calvin_42 for the extra touches. So far it works ok for me but I'm still trying to find optimal settings.