I think this is a HiJack bug as the Hijack "Button codes display" for that particular button returns 80FFFFFFFF [or 80 followed by all 'FF's for as many as needed].
No matter whether the button is released or pressed.
Other buttons work fine and return press and release codes.
So, I suspect that Marks Kernel doesn't map it over.
[it used to].
I'm not running the latest Hijack though - I think I'm a low 300's version though.

I will upgrade to 2.0 Final soon and then retest.