The two plugins I found that mess with event properties and might be popular are these:

https://github.com/aarongloege/jquery.touchHooks
https://github.com/timmywil/jquery.event.pointertouch

Rather than waiting for people to report a problem, let's be sure we added the relevant properties here. In particular, changedTouches and touches. By the time we remove pageX/Y we will still be way ahead on size.