Siri Remote "Press and hold"

I've managed to map the buttons the way I'd like to have them, and it's working pretty nicely.

But for the volume buttons (and the d-pad), I'd like the press-and-hold to just continue to send keystrokes as long as the buttons are held. It's not quite obvious how that could be accomplished, and the documentation doesn't seem to explain anything like that either.

Is this possible?