@JDDD I think I figured out how to make the calendar & mail scroll work (super complicated). Would be great if you could try 6.034 alpha (uploading now). It requires the "smooth scrolling (like trackpad)" scroll modifier to be active:
It basically transforms the scroll events to touch events - Apple made the calendar app to explicitly not allow horizontal scrolling for normal mice so we need to simulate trackpad events, which is very complex.