My sister is going off to university in a while, and as the computer guy in the house, I had to install avast pro on her laptop. When she’s away I want it so if the on-access scanner or anything else detects an infection, it automatically moves it to the virus chest. I fixed her up with some remote access software aswell, so if she does have problems I can schedule a boot-time scan from my laptop ( 
) and then just restart her PC. She isn’t really a techie, and I don’t want her to accidentally infect something or lose her work because of malware…
This should do what you asked for:
With pro version, you can configure the Virus page of the running Task (scanning).
See picture here: http://forum.avast.com/index.php?topic=13315.msg112285#msg112285