I love the mini-player for use while browsing, using Photoshop, or writing a paper. Plenty of control without switching windows. It's one of my favourite things about MusicBee. It's not a big deal, but I have an idea that I feel could streamline it a bit further.
The things I do most commonly with the mini-player are adjust volume and play/pause. For changing the volume, I almost never actually click the volume slider. I just shove my mouse to the top of the screen and use the scroll wheel, as doing so involves no precise action, so I don't even need to look to do it.
Currently, clicking the absolute top of the screen with the mini-player does nothing, as nothing is set there. It would be nice, I feel, to make clicking the top row of pixels play/pause MusicBee.
Keep up the good work. MusicBee is a great piece of software.