To change it between controlling the TV and AVR as the default, menu - settings - remote manager - volumeCholly said:
As for the discreet commands for power, the remote does have a learning mode, you could teach one of the unused buttons the power on command. That's also in the remote manager area. Select Aux Code, then "learn", then "Add Learned commands to existing code", then follow on-screen instructions. I think that'll do the trick for you.