I wanted to post a forum topic about the same thing... but you did it before me ;)
Chess.com, please get rid of the highlight last move (which has glitches; also, I know you can disable it, so don't tell me about it) and/or let us click+click to move pieces instead of having to drap and drop. Please. It would really help me, and most everyone else on chess.com.
On some areas of the site I've recently found that I can't click to select a piece, then click on the square I want it to go to. I must drag and drop instead. This is a frustrating pain as I am on a MacBook Pro that constantly drops the piece on the wrong square before I get to the one I want. Both tactics trainer and the computer as opponent seem to do this. but daily puzzle works fine.
On other sites I have no problem selecting a piece and clicking on the destination square. Same on other computer chess games.
Do other people have the same problem? I'm checking for updates to Java etc but I think I'm up to date.