Unfortunately it disables ALL multitouch actions, so you lose the multitouch zoom as well, but in my opinion getting rid of the annoying multitouch rotate is a greater advantage than the loss of multitouch zoom.
To install it, open the disk image that downloads, and drag the plugin to your Applications > Photoshop > Plugins folder, and restart Photoshop. If you find this annoying, like I did, you can download a plugin that Adobe has made available that disables multitouch functions in Photoshop CS4. The most current version of Adobe Camera Raw for Photoshop CS5 is 6.7.1 Photoshop CS4 (October 15, 2008) The most current update for Photoshop CS4 is 11.0.2 The most current update of Adobe Camera Raw for Photoshop CS4 is 5.7 Photoshop CS3 (April 16, 2007) The most current update for Photoshop CS3 is 10.0. In short: this “feature” really gets in the way of getting work done. Am I able to run Photoshop CS4 smoothly especially with my graphics card I heard it uses the GPU or something. I want to install Photoshop CS4 and use it to edit jpeg and gif files such as touching up holiday photos etc. When you try to zoom (or even if you’re accidentally touching the trackpad with two fingers) Photoshop often rotates the canvas by a few degrees or more - and there seems to be no easy way to set it back to straight without painstakingly using the multitouch rotation tool again. I have a MacBook White 2.4Ghz with Intel GMA X3100 graphics.
Adobe’s implementation of multitouch features in Photoshop CS4 for Mac is very annoying… although multitouch ‘pinch’ zoom is useful, the multitouch rotation, which is extremely sensitive, isn’t.