Would be cool if instead of picking each password breaker from the list, there was also a button that would automatically select an available password breaker. You could just put the link "use available breaker" (or something similar) right beside the "start crack" button and clicking it would automatically start the crack on a breaker that doesn't have a crack already running. If none are available or you need to overload the CPU, you would simply get an error message and then you could overload/crack manually from there.
Would speed up and make grinding a lot more fun.
or it could just select first available PB automatically w/o any buttons. i can make a script for that if you use opera (or firefox with greasemonkey, but i will take longer)