http://bugs.winehq.org/show_bug.cgi?id=34613
--- Comment #2 from Ken Thomases ken@codeweavers.com 2013-10-01 20:01:46 CDT --- Actually, I did add a registry setting. I just completely forgot!
I just added the explanation of the CaptureDisplaysForFullscreen setting to the http://wiki.winehq.org/UsefulRegistryKeys page. If you set that to "y", then the Mac driver will capture the displays and that will disable hot corners.