NIS2010: Idle Full System Scan imposes its will

My computer is never idle. At least for 10 minutes or more (Idle Time Out). When I'm not using it, it's in hibernation. So when X days passed and NIS never found an opportunity to perform its Full System Scan, it insisted on doing it while I was actively using the computer (I did look at the idle bar, and it was all black, whatever that means). Is this enforced behavior by design or is it a bug? I've seen other talk about this in past years, but it's surprising to actually see now. I've disabled Idle Full System Scan for the time being. BTW, guys, how about putting a way to stop the scan on the tray icon. Where you have it now (Norton Tasks) is almost impossible to find.