When you use the LEFT/RIGHT arrows to change frames in Layout, when it gets to zero (or the first frame, whichever) and/or the last frame, it loops around.

I hate that.

I'd like to have the OPTION for it to simply stop at the ends, like almost all playback s/w has, OR to loop. And heck, ping-pong too as long as we're adding features.

UI: radio buttons for this. This is one place I think we can use icons.