If this suggestion has already been offered, my apologies for the redundancy.
(BTW, ccleaner is the best maintenance app I have found... excellent work!)
It would be really useful to integrate into the user interface a tool to create a scheduled task to run ccleaner at a scheduled date. The tool could simply make use of the Windows Task Scheduler, but the interface would be located within the ccleaner app. For a similar example, see SpyBot-SD. In the advanced section you can create a scheduled spyware scan.
Thanks!