Your comments

I've been using ST2 without Grails support and there's no way to go back to STS. If we could have some of the features available for ruby... It'd be awesome.

If somehow we could run grails interactive mode inside ST2... I wouldn't know what to say. :)

Ps: The gsp's are almost fine if you tell ST2 to use JSP syntax for them.

There are tools with interactive console that also works in windows, such as grails or even the roo. It'd be nice to have the console inside ST2 instead of working with 2 open windows.
Since grails has an interactive console, it'd be nice to have a windows/unix console on SublimeText too.