Originally Posted by
TisMyDroid
Actually, I have done that in the past...used a task killer to stop all running processes on demand, knowing the necessary processes would turn back on...but at least, it turned off the extras. On my older droid phones, this seemed necessary to do every once in a while because the phones could not handle everything I might have running. But these newer phones don't have that problem so it hasn't been necessary.
Anyway, the short answer to that question is that to use the task killer on command on occasion will not kill your battery, as long as you make sure it is not set to automatic.
The answer to your second question... my suggestion would be to get a toggle widget where you can toggle your data and Wi-Fi off while you're at work, then toggle it back on when you need it. I use widgetsoid because I can set it to have access from the notification bar.
The other option would be to set up Smart Actions battery extender (if you have that on your phone) or get an app that does similar (I use automateit) ... battery extender will turn data, Wi-Fi, sync off when your screen is off and turn it back on when screen is turned on.