Is there a way to use the one finger swipe gesture with the Apple Magic Mouse in Google Chrome as the back button, just like in Apple Safari 5.1? I know one can set OS X back to use the two finger swipe,and in this case it the gesture works fine in Chrome (and any other browser), but I would like to use the one two finger swipe in Chrome. I'm using the Chrome canary build.
EDIT: This answer only applies for the trackpad, and does not work for the Magic Mouse.
The answer is yes. I'm not convinced this is too localised, as this set up is very tied in to OS X Lion, so it's likely that this will trickle down into the main build and remain true. Additionally, as of the date of writing this, the same method works in the Google Chrome Beta channel.
Anyway, open System Preferences, then open the Trackpad panel. Open the More Gestures tab, and then change the Swipe Between Pages dropdown setting to read Scroll left or right with two fingers.
The screen should then look like this (with the relevant option highlighted):
The latest Google Chrome Canary build (15.0.855.0) supports the one finger swipe gesture. This feature will probably be pushed down to the other Google Chrome builds other time.