Hi,
I purchased Jaikoz about 6 hours ago, and so far, I’m extremely satisfied…
After seeing the wishlist sticky, I am VERY excited about the last.fm genre tagging support!
I am a DJ, and I sort all my MP3’s by genre, so this feature will save me about 2 to 3 hours a day!!!
Thanks for this awesome program 
Yeah I would like the Genre thing as well, since I find it very hard to put a specific gerne to a song/Artist.
Ive implemented the Musicbrainz genres because its a better fit with jaikoz and lets genres be fixed at the same time as the other data.
Also we can help improve the genre data in the musicbrainz this way.
Fixing genres from MB has been added in 2.5.0 (beta).
Please try it out and let me know what you think - this includes submitting tags to Musicbrainz There is an issue in Musicbrainz that means its a bit slow to submit tags to Musicbrainz at the moment, so best to do this overnight.