What exactly does this modifier do? Could you give some examples of usage?
My instincts tell me that it's for limiting smarlist results from individual artists or albums, so your smartlist isn't too heavy from one artist, genre, whatever. However, I can't figure out how to tie it to other fields; it just limits the smartlist's length as a whole.
Here's an example of a smartlist that I'd like to limit:
genre=[Pop] rating=3,4,5 ~t=120 ~sort=random
This produces 2 hours of pop music. Most of my pop music is from "Various Artists" albums, which makes this smartlist very much like listening to the radio. However, I have two albums from Christina Aguilera, and so this smartlist always ends up very heavily populated with her songs. I figure that I could use the ~% modifier to limit the artists that populate the smartlist, so that I get a better spread, but I don't know how. Now that I've dragged the question on way way too long, I'll await y'all's input.
Cheers!