Fast reboot is not a task killer. The two are completely different! Re-boot is the same as a battery pull/to restart the phone, and a task killer kills running apps. The only good task killer would be the one that comes native on the phone all other task killers ( third party ones from the market) chew up your battery like no other and most people here as well as myself refuse to use them as they do more harm than good. But fast reboot and task killers or two separate things.
Sent from my Updated and Re-Rooted Og Droid Razr sliced thin!