As per this comment, it would be wonderful to replace Picard's useful but simple comma-separated blacklist of specific genres / folksonomy tags with a full line-separated list of both what to exclude and include.  (Sort of similar to how .gitignore files work, perhaps.)  Support for wildcards would be a bonus, regexes doubly so.

Hypothetical examples:

+*
-*rock*
+rocksteady

This would allow genres by default, but exclude any genres with rock in them... except for rocksteady, which would be included.  Conversely:

-*
+*acid*
-acid jazz

This would exclude genres by default, but include any with acid in, except for acid jazz, which would be excluded.

So this would allow people to tag everything on MB with any and all appropriate genres and folksonomy tags, both subtle and gross, then pick and choose which of those to pay attention to in their own collection.

Thank you!