Rubber band selection works fine.
Repeated quick moving and selecting doesn't make it go nuts, even when the fade out animation is still running.
Auto scroll in both popup and as containment is erratic; not sure if this is caused by this patch, however.
Using Tilain the rubber band is now white, for example, using Oxygen it's a fainter blue.
I did not yet remove the RubberBand cpp stuff as I wanted to get some feedback first before messing up my local repository :)