"Mouse wheel" scrolling is ridiculously sensitive and unmanageable when using track pads which send out many signals in quick succession (such as on the MacBook Pro). Unfortunately, since there appears to be no way to know directly what type of device is triggering the mousewheel events, it is not trivial to somehow normalise or "tame" the input from the track pad without also affecting the "1 tick per click" behaviour of the standard mouse wheel. @darsain has described the same phenomenon in this discussion at the sly.js project. Ideas are appreciated.

Here is a recording of a light swipe using two fingers on a MacBook Pro track pad:

The following is a recording of a down-scroll of 4 ticks using the mouse wheel on a USB mouse:

dt is the time (in milliseconds) elapsed since the last event.