Well one of my favorite things for forum software systems is when you press like alt+shift+s and it clicks create thread/etc or post reply without you having to move your mouse.
Don't know if this has been talked about just hopping it gets put in .
This looks like a straight WebKit bug. Firefox and IE act correctly. Opera is a big weird once you flip into access key mode. Fortunately, you can tab out of the editor to the reply button.