It would be handy to limit the playback & arrangement (loop & section) control of some users on the Perform Tab of the SR Remote app. When there are multiple users, typically one controls the Show and the others just use it as a reference for arrangement, chords, & lyrics. It's easy to touch the wrong thing when swiping Tabs or especially if relocating the control surface. A large red 'LOCK' button or similar individual user activated feature would be helpful on the Perform Tab of SR Remote app.