Well CCleaner is a fine piece of programing - but more wants more.
First of all I would like CCleaner to be able to run on exit saving time when booting later on. An option to choose files using wildcards would be nice too.
Third - cleaning certain types of files mostly tmp using schedule
Tmp files are by far the most time consuming files on any hard drive and I have never seen deleted tmp files causing any trouble, this said because I not fully agree with the 48 hour option - TMP files can be deleted on the spot - those which are in use are locked by the system - so no danger.
All this because I have moved to Windows XP x64 (and it applies to Vista too) in which you cannot make use of good old batch programing to an extend which XP 32 bit allows. Sag but true. My old setup, which only was able to perform a fraction of tasks compared to CCleaner was to move the temp folder to the root dir which could be reached by a batch (cmd) file and deltree. The batch file was hooked up to Schedule deleting tmp files among others once every hour keeping the computer alert at all times and on exit by adding it to "scripts run on exit" in the group policy editor.
So I hope this was a little insperation to further development