ROO-46 mentions Bouml and some other 3rd-party projects that can generate a Roo script from a UML diagram. I'm not sure how much mileage there would be in a more general Roo GUI. I guess it could discover which commands exist (based on what addons are installed) and which of those commands are currently available. Another interesting feature could be a list of available addons (via RooBot) that allows you to install them as desired? As for delivery format, I think an IDE plugin would be best, as you can then offer commands in the relevant context (e.g. right-click an entity's Java source file and choose "create integration tests").
Also please see ROO-731, which has some further ideas.
Last edited by Andrew Swan; Sep 6th, 2011 at 07:08 PM.
Reason: Mentioned ROO-731
"Now is the EJB of our discontent made glorious Spring"