This is a UX improvement. I find when I have any movement cards and don't foresee needing them, (like when there's just one enemy left) I just use them to go back and forth in the same spot; might as well just allow them to be discarded them with a middle click (or an X on the top of the card) or something. This would alleviate an additional 2 or so clicks.
Yes, yes I guess I can. This was spawned from the situation where I had like 4 movement cards, and thought I was refilling up to 5 cards for some reason. Feel free to disregard.