Is there a way to "lock" the room selection on iPad to one specific player ? We have an ipad on the bathroom wall controlling Sonos 1 ib the bathroom. If some one use any of the other Sonos in our house - the room selection changes also in the bathroom. Could be useful to "lock" room to each controller, like one iPad for bath, one for kitchen, one for the living room etc. We use several Sonos 1, Sonos 5 and bridge.