Currently the behavior of ALT+click is hardcoded (according to kelnos in #xfce) I need to modify the behavior of ALT + click to get Photoshop to work right. (http://www.codeweavers.com/site/support/docs/crossover-pro/troubleshooting#PHOTOSHOP-ALT-CLICK)
Additional information: This should probably go under window manager preferences/settings
FAQ: http://www.xfce.org/index.php?page=documentation&lang=en#hidden_option_2