A GitHub Feature Request
I propose a feature that lets you edit one line of code, in place, instantly, no hassle - providing nothing but the updated line of code, and a short 1-line comment explaining why you'd like to make this change.
Why? Because it's the little things that count. How often do you glance over code on GitHub and think, "oh, I could fix that real quick". But you don't want to fork the project and submit a pull-request, much less have to maintain your own fork (and have it show up on your GitHub page) so you just leave it alone.
Think of the overall quality increase, if all those little tweaks got made every time somebody spots something ugly, and actually made it into people's codebases - many drops make an ocean, right?