This posting is older than 6 months and can contain outdated information.
Have you succeeded to enter the hotkey as suggested in my previous post (http://www.iospirit.com/support/forums/remotebuddy/singlethread/14992/) - i.e. does the field now read "Cmd F2" (or "88 F2")?
Depending on your keyboard and settings, you may have to press the Fn key on your keyboard to enter F2 instead of adjusting brightness.
If you read Cmd F2 in the keystroke field and the execution of the action doesn't result in a switch, chances are the switch can't be triggered by a simulated keystroke - only by a real keystroke from an actual keyboard.
Best regards,
Felix Schwarz