From what I understand, RockIt will work with any MIDI controller - including the Hercules type. But for now, you'd have to do your own mapping - not difficult, but a little time consuming.
The 4.1 release will make mapping a lot easier - again from what I hear - as it will include some type of mapping tutorial program.
I'm getting ready to switch from Red 5.2 to RockIt. So far, I love the program. Having everything on one screen instead of 3-4 different tabbed screens is great.