Is there a way that the +2 editing bonus's existence could be better promoted to new users? This could be especially helpful for students or others new to the field on the more technical sites, where getting the first 50 rep (ability to comment) by asking/answering can be very difficult.
As a lurker and occasional Stack Overflow poster for several years, I had no idea until today that you get +2 rep for every accepted edit. I really wish I'd known this sooner--I'm a native English speaker who likes editing, and when I was a student, it took me forever to get enough rep to comment on Stack Overflow. This was frustrating, because it meant I couldn't ask for clarification on answers.
The most obvious response to that frustration is "just ask or answer questions!" That's WAY easier said than done, especially as a student and on such a mature, active site as Stack Overflow. Most of my questions had been asked already, and I was afraid the remaining questions would be seen as "too specific" and just get downvoted. With the few new questions I knew enough to answer, usually others beat me to it. Or I was afraid my answer would get downvoted because the question was low-quality. (-2 reputation points from being downvoted is a big deal when you're struggling to just reach 50.)