TinkerTool for Mac provides quick access to otherwise buried settings and features. Through this app, you can tweak and adjust features as much as you want without worry, because you can always revert everything back to the original settings, with just one click.
Interface layout: This app's interface is organized by location, with icons arranged across the top of the main viewing window for Finder, Dock, General, Desktop, Applications, Fonts, Safari, and more. When you select one of these locations, the various options for customizing their behavior appear below this menu bar, and you can quickly switch from one to another at will.
Individualized changes: Any of the changes you make through this app apply only to your current user account. Because these aren't systemwide or permanent changes, you don't need Admin privileges to make them, and you don't have to worry about impacting other users if you're on a shared machine.
Limited Help and descriptions: The only Help available for this program is a FAQs page, and there are no explanations for the items listed that you can change or turn on and off through the app itself. That means you're left basically to just find out what happens when you make changes through trial and error, which is fine because the changes aren't permanent, but much less efficient than it could be with descriptions that are a little clearer.
TinkerTool for Mac customizes your settings and features. The lack of documentation and descriptions can be off-putting to inexperienced users, but the reversible nature of the changes makes it unlikely you'll do any harm by poking around.