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I'm considering an option to jump straight to the main menu, though, for those that want this functionality.
Another observation, and another humble suggestion: I noticed that when you dismiss the RB menu and later call it back up, it opens to the same place it was when dismissed. So say you use the music browser to play an album and then dismiss the menu. If you later want to browse to another artist/album, you have to dig your way back up the the music browser to proceed. Likewise to change the song's rating, quit the behavior, etc. It might be more convenient (for some users anyway) to always go straight to the iTunes behavior menu... just as it might be more convenient for other users to always go straight to the main menu (as discussed above).
So if there is to be a user-specifiable option in this regard in a future release, it would be ideal to have three options: 1) go to the main menu; 2) go to the current behavior's menu; and 3) go to the last open menu.
That, combined with a user option to dismiss the RB menu automatically when performing actions, would make the program very flexible and easily customized to a particular user's needs.
