I think they will upon the stable release version, and also i think they will make a way for us to set mma as our default player then.

If the uninstall will ever remove the mma db i dont know.

Do you know if there will ever be an UNINSTALL with MMA that will actually remove all of its music. It it put it there it should optionally be able to remove it .. yes?

Not as far as i know? But if small library then just delete it from the device and uninstall mma then run your junk files cleaner, i use " Tap1" then reinstall mma and readd your library.

Is there a database rebuild option for Android devices running MMA? If so, can it be activated without USB connection?