Is there a funciton to reverse the playlist order? I like using the "least often played" option in the Shuffle menu, but what I really want is to listen to a playlist with the most often played songs up front. Any tips/tricks that will do this?

Yes, you can create a custom shuffle for Most Often Played. There's information in the Developer Info section of riocar.org on how to do this. I haven't yet moved that information into a FAQ because I still can't get custom shuffles to work right for me.