I found in some other thread an answer to my question about stopping the Rotator to continue scrolling past the last item (WrapFrames)...
And I found a thread that shows how to preserve the selectedIndex in the rotator as well... however, when combining WrapFrames="False" and setting the InitialItemIndex to the correct index the RotatorScrolling seems to get messed up.

For example, if you have 10 elements in the rotator and only 5 items are shown at the time, you can scroll to the next 5 elements without problems. If you then select item #6, it correctly shows me element 6 (index=5), the index is preserved correctly but I'm suddenly able to scroll NEXT, but not back. If I click the Next (show the next 5 elements), I see the first 5 elements...

Know issue? Or have I done something wrong ?

Hello Stein,

In your scenario you need a custom scrolling functionality which is not provided out of the box by the RadRotator controls. This is why, I recommend you to implement a custom scrolling which will fit your needs by using the approaches described in these online demos:

• http://demos.telerik.com/aspnet-ajax/rotator/examples/clientapicontrol/defaultcs.aspx
  Please note that you have to check whether the rotator can scroll before initiating the actual scrolling.
  
• http://demos.telerik.com/aspnet-ajax/rotator/examples/pagerintegration/defaultcs.aspx

I hope this helps.

Sincerely yours,
Fiko
the Telerik team