Hi Andreas,
Just got your email.
I found out that the gobo-scroll-issue is a bug.
I did said that you could use a custom fader, but I just found out that doesn't work either. Sorry for that.
The only alternative I can suggest is that you create 3 extra gobo's for gobo-scroll-slow, gobo-scroll-med and gobo-scroll-fast.
Gr,
Rick