You clearly failed to understand my post.
Gestures existed long before multitouch touchpads became common. Mouse gestures were very popular in Opera, for example; you could assign any action to any motion (with some buttons pressed).
Touchpads with gestures "specific" for MS Windows typically have *keyboard* shortcuts hardcoded, i.e., they send stuff like Win-arrows or Win-D to the host. Meanwhile, there are at least 9 standard pointing-device button actions—usually interpreted as primary three clicks, scrolling in four directions and back/forward. The device could easily send those standard codes, allowing users to configure any actions they like. However, it's only possible with some Logitech touchpads and a bit of low-level hacking AFAIK.