I regularly clean the Registry crap with CCleaner (great tool, actually), but it lasts too much because of the unnecessary steps (5 mouse clicks or so) that i should go through until it does the job.
For me, a one-click scan and a one-click clean (without questions) would be optimal, but for the sake of secureness, with an automatic registry backup before the clean operation.
A checkbox 'Always backup registry automatically before cleaning' or similar in Options > Advanced would be useful for that.
I'm not sure, what happens if 'Show prompt to backup registry issues' is unticked, it may save registry automatically but it may not.
Running CCleaner silently with /AUTO is not an option, i like to see what's happening.