If you want to make it work you can. It's kind of a hack.
Fire up Locomotive and right click on your app and select open in terminal. You will see that it executes a temporary script to set up your environment.
If you copy that scripts contents to your $HOME/.profile it will be available to you in your entire login account (including radrails)
You'll be a lot better off if you install rails and rubygems from source. It's not that hard and there are several popular how-to's out there. It takes about 10 minutes.
