Reverse scrolling sideways only possible?

[PhazonUK]

Just bought a new 11" Air and have a question regarding the Reverse Scrolling option.
I'd like to be able to have normal up/down scrolling (e.g. Safari & Pages) to be normal but the sideways multitouch gestures (switching between spaces) to be reversed so that they act like multitouch on an iPad.

Does anybody know if there is a way to change this?

 

[Cynicalone]

John Siracusa (of Arstechnica) mentioned this app that does what you want to do.

http://pilotmoon.com/scrollreverser/