My XF86Config has:

    Option "Buttons" "5"
    Option "ZAxisMapping" "4 5"

... but then when I updated to 3.99.15 kernel+userland as of.. mm.. a 
few weeks ago anyway, my mousewheel stopped working for me.

Is there a utility or some kind of identifying software or marker that I 
can use to show me what signals happen when I click the various buttons 
on my mouse?

Additionally, cat'ing /dev/wsmouse0 and then scrolling the mouse 
produces no garbage on the screen the way the other buttons and 
movement does. Would this be an indicator that wsmouse0 isn't passing 
through wheel data anymore?