Tracked controller inputs for world space UI are registered as mouse events. This causes manipulation events not to fire, which prevents features like panning in the scroll viewer component.
Manipulation events can be used with the "emulate touch" option however, this approach has its own issues. Eg. Hover effects based on IsMouseOver don't trigger. For a vr solution, having both hover effects and scroll panning would be ideal.
Additionally, a way to control the threshold to start the SrollViewer panning would also be needed. Because it's currently optimized for touch input, but in vr, the pointer can move much more and dragging can get triggered accidentally, when intending to click on an item inside the SrollViewer instead.

This is in reference to the following forum post: https://www.noesisengine.com/forums/viewtopic.php?t=3199
The click event canceling mentioned in the thread was an unrelated problem.