OS 10.5 - Any hotcorner hackers out there?

Right now I'm rocking a three monitor setup where the center screen is connected to a KVM switch. This allows me to connect two towers (one Mac Pro and one PC), giving me dual monitor set-up on both (Mac on left and center screens and PC on center and right).

Right now I'm using a four stroke keyboard combo to switch between the two systems. I know that out of the box it's not possible to set up hot corners to activate scripts or keyboard combos but I'm wondering is it possible? Is there some third party software for Mac that I can use or are there any system config changes that I can make so that when I drag my mouse into the corner, the keyboard combo to switch to PC is automatically punched in?

Any help would be appreciated.

P.S.: I know this sounds lazy but I just think it would be pretty sweet to use the same mouse movement to travel through all three screens and two different system automatically.