BUG:
in newest release pressing and holding control for more then a few moments cuases the screen to become very jerky/low fps. this does not happen in 1.8g, i did not test other modifier keys but i did test that it was not happening in 1.8g before posting. at the time i had 3 wow's running on 1 computer and i can upload my config file if you need it.
Had the same issue but I think I was spamming the keys at that moment, my FPS dropped to 1-5 or something and some commands were sent to the other clients about 3 seconds later or something like that, changed back to G, too.