I just replied in the thread below yours about Cubase control. It’s the same way for Nuendo (which I use) and I haven’t gotten any replies on it in the Nuendo forum or from them, so I’m not sure whether it’s being looked into for any of the version 4 stuff. Cubase 4 appears to have the exact same documentation for the Generic Remote, so I’d guess for now, it’s the same.
I saw you mention buttons and LEDs, so keep that in mind if you go with the generic.