Each playlist or intelligent playlist had its own sorting rules

If only the contents of a playlist had its own sorting rules.  say   first by genre and then by bpm.

I put Mixed in key info in the comments column and have an Intelligent playlists with rules such as comments begin with 1A, 1B, 2A etc.    In a collection with some 4500 individual tracks , each intelligent playlist has quite a number of tracks.  If I could only assign sort rules for each playlist

And 128 intelligent playlists is not enough.