TinkerTool is a PrefPane that opens up a bunch of “hidden” settings in your OS. With it, you can do things like mess around with Finder, disable the Dashboard or even add a stack of recent items to your dock. You can review all the settings it makes available here.
Even though the developer says that it is safe to use and nothing can go wrong with it, I’d rather not mess with shady settings that may slow down my machine even more or cause unexpected things to happen. But to each his own, and I might even try some of these myself!
Requirements: Mac OS X 10.6 or later
Developer: Marcel Bresink