dihard Hmm I just tested this out on my Q2 with DeoVR and didn't have this issue - scrolled through the left menu and my scrolling up/down didn't affect the video's zoom/playback speed/etc.
I DID notice though that if I tried to scroll without clicking (so that actual cursor was visible) that it would THEN zoom in/out on the video until I clicked to show the cursor. Could this be what you're seeing? Or lemme know if I'm misunderstanding something...it happens now and then 😅