Mike Jennings: Sure thing, currently you can flip the image horizontally (by pressing p), but you can't flip it vertical, i.e. so it's upside down

Yf Vfx: OK, that's what I was guessing. Can you describe the cases when this would be useful?

Mike Jennings: Difficult to think of specific examples, but say if you're looking at a landscape, you could flip it to imagine it from a different perspective. Ideally you could control the vertical AND horizontal flip. Sometimes you want to flip, sometimes you want to flop, sometimes you want to both flip and flop

Mike Jennings also to check the centralisation/balance of the frame, or for a number of misc debugging/alt view purposes