Trackball scroll

[cdarken]

I'm trying to make my Elecom trackball to act as scroll wheel when I hold the forward button.
I'm setting a variable when holding it.
Then on Y Up/Down I have if_eq($scroll_held, 1, wheel(up, 20), mouse(up, 10)). But the cursor speed feels odd, which I guess is because I didn't set the proper speed and acceleration. Isn't there a way for input-remapper to just specify in the else branch to act transparently, just use the speed that is detected from the device? Or if it's not possible can I determine those defaults?