Are questions allowed that ask what settings one should chose if one prefers quality or performance?
E.g. "When I want best quality, should I chose bilinear, triliniear or anisotropic texture filtering?"
I think a post asking about what differences exist between certain video settings is definitely fair game. (If, perhaps, on the technical end of things)
It's certainly not much worse than one of our more popular questions on the site.
Just make sure not to write questions that boil down to "What graphics can my system support?" (Too localized), or "Which is the best texture filter?" (Not a Real Question).