quidnunc speaking of HereSphere please look into copying its video drag functionality. It's better than the drag in DeoVR both to adjust and also seems more degrees of freedom
I suggested that a while back, hs drag images moves slower and smoothly like a camera , deovr drag images moves faster. I debated this and now i would suggest maybe options to pick the speed it moves, hs is great but sometimes I feel it moves to slow, but I really like how it moves. But I agree...do something to the drag image.