Plugin for a proprietary source control system

Hi

I am one of those unfortunate folks who has to work with a proprietary source control system. Thankfully it has a reasonable command line interface.

I want to write a version control plugin for it.

Is there a way to create a plugin to seamlessly work the way say CVS is integrated with IDEA? I looked at the demo, started with a new project and when I try to create a new action and choose a Group, for instance, I don't see a "Vcs.Checkout" group.

Has anyone done this before? Any guidance would be very helpful.

anand