Keep Keydown on Siri Remote?

I want to assign the [1 finger Click] to [Space] key to play/pause on YouTube videos as well as YouTube's recent feature of 2x speed playback by a long press.

The [Send Key Down Only] and the [Send Key Up Only] options alone don't help it.

Normal Keyboard Shortcuts have the [Trigger on Key Down] and the [Trigger on Key Up] options which help it emulate long presses, which Siri Remote settings don't have.

Are there any technical restrictions on Siri Remote to handle long press signals?