Oh, well then I'm wrong.

I just assumed unshuffling and reshuffling would reshfulle the entire list (you can see I've only begun to user the shuffle feature recently). That's really cool! You guys have really have thought of everything.

Still, if it does work that way then that makes the case for what I'm proposing even better, as you'd have the ability to either insert a playlist in order in the middle of your current shuffled list or shuffle the new playlist into the remaining tracks. The only thing you'd lose is the ability to insert/append a block of shuffled tunes, which admittedly some people might want (or actually, do want it seems).