It's bad enough that Apple expect people to touch their trackpad with two fingers, because the thinking-differently company couldn't be bothered splurging on two buttons. Three-finger swipe for this, four-fingers for that... How's anyone gonna remember all those combinations and permutations?
Now Canonical wants to makes things a whole order of magnitude worse: multi-touch gesture sentences. Mark Shuttleworth writes:
Rather than single, magic gestures, we’re making it possible for basic gestures to be chained, or composed, into more sophisticated “sentences”
How a gesture sentence operates:
For example, the user might initiate a three finger gesture, remove one finger but continue with the movement as a two finger gesture, then remove another finger to finish the chain with a single finger movement.
Canonical's uTouch 1.0 multi-touch and gesture stack now works with Ubuntu 10.10 and certain computers.