If you're trying to identify a feature, please use "Identify feature" instead. Refined GitHub only implements lightweight features that are helpful to most people, even if they're tiny improvements. They're meant to "blend in" and fill in the gaps of GitHub's interface.
If you want to go through and only select a few improvements, you'll miss out on the best parts of Refined GitHub. Also note that new features will still be enabled by default and that some CSS-only refinements cannot be disabled.