Anidate gestures with different actions

Make it possible to "drag & drop" gestures to anidate them, so the child gesture will action only if it was triggered after the father gesture.

The idea is to simulate the same action as the trackpad. For example, a gesture to bring mission control, then the opposite gesture to dismiss mission control, and then use the same opposite gesture to trigger another action.

In the UI, I imagine something like this.