I have been using CC since the beginning. Crapcleaner is such a good program that I regularly donate to enourage the creators. We should all do this
One feature I would like to see added is a prompt from CC when it has not been run in the last day. This could be on a time basis or a reminder when Windows is rebooted.
Why don't you just setup CCleaner with the "Auto-Shutdown" option.
At the end of your browsing day, after closing down your browser or whatever, is probably the best time to run CCleaner, and you have to press a button to shut down your PC, so why not make that button the "Clean and Auto Shutdown" CCleaner icon in your Quick Launch bar.
It's now second nature for me to shutdown my PC in this way.