3 finger gestures in Lion
So, I've worked out how to change the trackpad so a three finger swipe left goes back a page and a three finger swipe right goes forward a page, but a three finger swipe up or down used to go to the top or bottom of the page, how do I get this back? There are some very large files where this was useful, I can use cmd + up or down arrow, but it would be nice to have the old gesture still working and it wouldn't mean the three finger up and down swipes aren't redundant, as they are at the moment.
MacBook Pro, Mac OS X (10.6.7)