Feature
Rage-click detection
A burst of clicks on one spot becomes one rage_click event with its count.
Three or more mouse clicks within 1 second and 30 px of the first, on the same target, collapse into one rage_click carrying the click count. Touch is stricter: four taps within 44 px, and taps right after a scroll are ignored.
The event also carries how long the page took to react, if it reacted at all, so an agent can tell a slow control from a broken one.