Haven't noticed any issues like that under Windows, so please open an issue with more details. You can also try either enabling a native window handle from "Settings > Interface > General > Use native window", or enable a native window frame from "Settings > Interface > Title bar > Disable Application title bar".
I'll also see if I can implement something like that!
Only devices exposing to the Web API, and logged in with the same account, are currently supported. If you know that a device you're trying to use is exposed, please open an issue with more details.
Interesting though, could be good if it offers better playlist management, for instance I'd like to see all artists who's songs I've liked.