MacPilot
A newer version of MacPilot is available.
Or, Learn More About MacPilotVery good
Full user review
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"Great app to safely tweak the system and multiple apps"
Pros
No fuss property editor and more for most common and not so common system preferences and most popular applications
Cons
It's not free, but the developer needs to feed his kids. I happily paid for it
Summary
I consider myself a pro and I'm at easy changing property lists. Although I don't usually want to spend time googling for the right property to change some annoying system behaviors.