right now you can try to create several run configurations (based on ruby or gem run configurations templates), you will not be able to get the same level
of integration (e.g. when RM creates configuration to run current test) it is not perfect but better than nothing.
We are working on zues integration (it looks more mature than spring) and I hope this will be done in Momiji (our next major release).
Hope this helps, Oleg.