On a countless number of times where I have been called to cleanup a clients PC the first thing I see on their desktop and most sub folders are the endless amounts of random installers that are left over and never deleted. These include Itunes, CCleaner installers <- which you would expect CCleaner to at least delete its own installer, AOL installers, etc. The installer files take up a bulk amount of space when they're left around.
Obviously some people would want the option to keep certain versions of installers, and possibly larger installers that they don't want to have to re download. This is why you could possibly make a separate tab for this option under tools. Maybe a "Old Installer Cleanup" tab of sorts. It could scan and list all installer files and that way you could check/uncheck whichever installer files you wanted to keep/delete.
Now whether something like this is even possible or not is beyond me, that's why I am posting here! I've been looking around for something like this for a while, and figured the best cleaner tool around should have the best utilities in it as well.