Uncheck the option mentioned earlier in the thread, as this will stop it changing your status when you go into lock.
Then, create a script with the following code:
code:
function OnEvent_MessengerLocked(){
if (Messenger.MyStatus == 3){
Messenger.MyStatus = 5; //Set to BRB
}
}
This will simply set your status to brb whenever your status is online and you lock messenger. (You'll need to manually change your status though when you unlock however)
Hope this helps