What i did is that when you press the playstation button (original in my config to start the XBMC) for more than 2 sec it just Close XBMC if it is running , so we got the playstation button to do the double job BUT !!
Playing with this new macro accidentaly i found that if you press and hold the playstation button for about 7 sec the the remote disconnects from the bluetooth dongle ! I dont really know if it does into sniffing mode or into power off mode but if you press any button after it connects again and does the action !
So the point here is if somewho this can be usefull for a coder maybe maybe not , i dont know if you can sniff what ps3 remote does internally and if you can trigger this action by sending a command remotely to the ps3 remote.
May the experts continue