I'd also like to disable/hide Play Doctor. No need or use for it, everything is handled by individual file or (mostly) by smartlist.
Play Doctor's appearances are confusing the family, because suddenly there's a prominent set of buttons that should never (in our setup) be clicked. It's like an annoying hotel TV that always switches back to house commercials and pay movie promos.
Given the wide range of situations where MC is a valuable application, each buyer of MC should be able to SHOW/HIDE any/all MC options/services, on the main screen, in the tree, etc. It could even be nice to let the user configure what the main pane shows when "at rest", such as wallpaper, or a list of playlists/smartlists, or the user's choice of common actions.