I'ts called, in infinite Sony wisdom, Adjusting the beam interval, and it's on page 86 of the manual.

Commander off/muting
Press set two times Press mode key
Press sys delay
Select your component name
Press "key"
Keys will flash
Press the key you want to adjust
No delay-doesn't flash
1 second delay-flashes
2 second delay-flashes slowly

This is intended to prevent accidental operation, so you can leave it on 1 second if you want to, or set it to operate with the first press of the button.