Hello fellows.
I would like to say thanks! The cec-utils package is pretty handy. The udev rules are perfect!
The only addition I've made on my arcade build was adding a turn off monitor.sh script in RetroPie Menu.
#!/bin/bash
# turn off monitor.sh
#################
# Actually puts the monitor on stand by mode.
echo standby 0 | cec-utils -s -d 1