this was the main issue that made me change my key broadcaster over to HotkeyNet.

Mouse broadcasting Hurricane, Force of Nature, Blizzard etc work so much better on HKN than on Keyclone.
I found with Keyclone that I was losing focus on windows and seemed to pause the last screen that was clicked on. Don't get me wrong Keyclone is a brilliant product that is very well written, and I probably wouldn't have started serious Multiboxing without it.

with HKN I have found that mouse broadcasting actually becomes useable and second nature. I even use the broadcasting to select and turn in quests on all toons at the same time!