Rotation/Separation Logic Options
An option that would allow you to select rotation logic for the playlist. Specifically by "Least recently played". in conjunction with the ability to adjust separation rules on a category basis.
Category Selection: Hot Tracks, Top 40, Recurrent, Oldies etc etc
Separation: Heavy Rotation (i.e.: Album Separation 1hr, Artist Separation 1 hr, Title Separation 1 hr, Track separation 1 hr.
Logic: Least Recently Played/Playlist order/Random
This is basically the same principle as most playout software. While a tad more complicated to implement, if this could be done, many broadcasters would drop software/dedicated computer options for this. I know I would ;) MORE CONTROL!