Nothing is here on the wiki page, and I'd like to play around with debug settings. I have no idea how to access it though. If you want to see the wiki page, here you go:
http://wiki.roblox.com/index.php?title=API:Class/DebugSettings
A couple of months ago, people were able to access the UserSettings
service through a LocalScript.
The admins decided to remove this feature.
My guess is that, to access the DebugSettings you COULD use
game:GetService("UserSettings"):FindService("DebugSettings")
Why do I think of that? Because you can access the UserGameSettings
the same way. Anyway, the answer that you are looking for is