Essentially, you could just right-click a song, or several songs, weather it is in the main window part, or the now playing part, and select "Play Next" or possibly "En queue" would be a better term.
Because I think it should work a little bit differently than the "play Next" function MM already has. I think it would work much better if it actually En queued the song/s so that they/it were played NEXT. Weather Media Monkey shuffling or not.
I think that just about covers it. So I'm just hoping that someone who can script would like this idea
Thanks!