Summary
This does not look very legible to me (in Opera, at least). (Not to mention those two additional clicks needed to get to it.) Now, the version I get when not logged in seems a bit better… Isn’t that a bug, RC feed should be ignorant of user options, shouldn’t it?
Is there any problem using edit summaries for… well… edit summaries? It is fine to improve feeds, but I am not really interested in feeds, I use the RC page and I can’t see a reason to have that page unusable.
I don't know what you are seeing in the feed.
Summary should be the reason why you did a particular change, which for new messages is always the same and should be left out. Like I said in the previous message, I and other people are trying to make proper tools for doing review. Until they are ready feel free to do what you think is best.