What happens when I select "Single key press on button press" is that I have to wait about 15 seconds for the action to happen (it is instantaneous with the keyboard). However, if I press another button during the 15 second waiting period, both actions happen immediately.

I have tried all of the various keystroke behavior options (key press on button press, press & release, press & release & autorepeat, etc) as well as toggling the option to send the keystroke directly to the application. None of these trials improved the 15 second delay. It seems that when the myth video player is active, it is somehow interfering with processing remote buddy signals, but still is receptive to the keyboard...