There are a few right now that do the basic job, but some additional presets would be great. You could take a cue from iTunes which has something like 20+ presets -- probably a few of those are not necessary but I think adding more presets to fit certain music genres would be a welcome addition.
If the presets were named after the genre (as most are now) that could help with another feature request I'll throw in - auto-presets. I gather that these take the genre and change the preset to fit if one exists? The ability to assign presets to different albums would also be nice.