Can't use touchpad's BTN_TOUCH event without breaking touchpad's functionality

[hxka]

So most new laptops, including mine, have those awful touchpads without hardware mouse buttons.
I always wanted to make some keyboard buttons to function as mouse buttons while I'm touching the touchpad, and this project comes tantalizingly close to enabling that.

What I was able to do is to switch a function of some keyboard buttons between themselves and mouse buttons with a keyboard combination which flips a flag every time it's invoked.

But I don't want to manually switch their functions, I want them to switch automatically on whether I'm touching the touchpad. And the touchpad sends BTN_TOUCH event iff it's touched, so it feels like I could use that.

I try mapping it to set(flag,1).hold().set(flag,0). It works! But, because the input is suppressed, the touchpad itself becomes otherwise unusable.

I try set(flag,1).hold_keys(BTN_TOUCH).set(flag,0). Error:

"Button TOUCH": The output_symbol "BTN_TOUCH" is not available for the "mouse" target. Try "".

Okay, what if I send the event directly? set(flag,1).event(EV_KEY,BTN_TOUCH,1).hold().event(EV_KEY,BTN_TOUCH,0).set(flag,0)
Still touchpad doesn't work, and the flag doesn't flip anymore for some reason.

So, what it seems that I need is for the option that enables not to suppress the input. Or maybe I'm missing something?