I have it set so that single-click MusicBee from tray launches mini player and double-click launches main player. I don't see a "minimize back to tray" for the mini player--there is only the option to open the main player or close MusicBee altogether from the mini player. If I want to use the mini player to quickly change a song, I would have to switch to the main player from the mini player and then minimize MusicBee back to tray.
Also, can I disable Inbox? I want MusicBee to read all music from a folder and any music in the folder should be automatically added to the library.