I just tried it out and it worked great.  Couple of things I noticed (in case you were looking for feedback, if not, ignore all of following).  
1.  I wish I could use some shift+keys or F9 keys.  If I were to use this application for anything beyond dedicated gaming situation this would be nice.  I would suggest using whatever control is used for assigning keys for windows shortcuts (right click shortcut, click properties).
2.  I noticed that the key press is still sent to the running application.  Maybe a negative thing in some situations in others it would be a positive.  
3.  I ran it with something that was in full screen mode and noticed a flash of the task bar at the bottom after every time I ran the application.  
Thanks,
-Valiam