Regarding the messages: 
You can turn them off altogether at RB > Prefs > Bluetooth Receiver

Regarding the disconnect and pairing behaviour of the BD Remote: 
The pairing behaviour of the BD Remote is very different from the Wii 
Remote. In most cases, you will not notice that the BD Remote was 
disconnected except for a short delay upon your first press that's 
caused by the BD Remote waking from sleep and re-establishing the 
Bluetooth connection. I personally find it to be very smooth.

Best regards, 
Felix Schwarz