How to disable gestures when a mouse is present

I recently obtained an older Mini and installed Lion onto it. So far I like it a lot. However the OS thinks that I have a trackpad and will not let me disable gestures. The scroll wheel on my mouse is backwards and driving me crazy. There must be 100+ posts on the net saying to open the trackpad control panel and then . . . to disable gestures. I cannot do that because the system is looking for a trackpad. I had to disable bluetooth in order to access my trackpad control panel, and so I cannot set any parameters.

Is there a preference file that I can edit to set the "disable gestures when a mouse is present" ?

Thanks!

 

UPDATE: Solved

The issue was that I needed to reverse the scroll direction. I was looking right at the answer but I was not connecting the dots. As that old saying goes, "If I had been any closer it would have bitten me." Hope this is helpful to other old-timers like me who are new to trackpads and gestures.

http://www.apple.com/shop/question/answers/readonly/how-to-change-scroll-direction/Q97XDXY9PFJACCDCT