For soup playlists, RMML (and I think the new jEmplode, but maybe it wasn't in that build) automatically rolls up tags to the playlist level (so an Album soup gets the Artist on it) ... I could make it do that for regular playlists too. It only gets a little funky when you change the tags later ...
Ah, yes. Well I, for one, wouldn't need it to automatically detect changes in the tags underneath, though it'd be swell if it did. For my purposes, a "once and done" approach would work fine.
Re: playlist order -- also could do that without too much pain. Are these soups or did you make these "by hand"? I've been working on making the soup sorting configurable ... It's still in the works, though.
I don't use jEmplode soups yet. These are the playlists that I originally got by dragging my entire "Albums" folder from Windows into Emplode. So it goes <Root>/Albums/<Artist>/<Source>/<Tracks>. So I guess they're basically "by hand." When I add new albums, I drag them into the proper artist folder. I'm guessing soup views would do some of this automagically for me, but I'm not yet using jEmplode as my primary emplode, so I've yet to venture into soups yet. So having this functionality in place for "regular" playlists would be nice, but I will definitely experiment with the soups first to see if those meet my needs.