Firstly, thank you for created a program that should have been included with windows to begin with!
When I do a thorough system cleaning, apart from running CCleaner there are a few other places that I must cleanup manually. For CCleaner to become a completely comprehensive cleaning program it would be nice to have the following locations included:
Roaming
"C:\Users\[user Name]\AppData\Roaming" - leftover user settings, many from programs I've uninstalled
Program Files
"C:\Program Files"- leftover files from programs I've uninstalled
Start Menu
"C:\Users\[user Name]\AppData\Roaming\Microsoft\Windows\Start Menu\Programs"
& "C:\ProgramData\Microsoft\Windows\Start Menu\Programs"
I always clean up my startmenu folders as well and group shortcuts into better categorized folders (a habit I carried over from using Ubuntu). At times there can be dead shortcuts left in the startmenu as well.
Lastly I think custom folder locations should be able to be added. For myself, I empty my "Downloads" folder as well and I'm sure other people have folders that need to be emptied from time to time.
Thanks again for the great program.