Hold down key to trigger

Is there a way to activate an action only when a key is held down? The Eject key, in my case, I'd like to repurpose, but only when it's held down and not single pressed.
In this post, the ability was discussed. Apparently it's possible, but a solution was never found for OP. Is it possible in BTT?

I'm not sure, but have you tried the new short/long press function? Maybe that will work.

Just found it has been added recently in the alpha! Thanks.