I really appreciate the work contest authors put into the editorials for contests, but some of my favorite editorials have had 2 features that set them apart:
Good hints are very helpful when upsolving and make solving a problem just a little out of your reach much more satisfying.
Problem Feedback: It shows that the author cares about feedback on his problems and lets me know if other people struggled in similar topics that I did.
I don't appreciate problem feedback
I don't think these features require that much effort but they really improve the editorial reader's experience in my opinion and I would like to see more editorial authors incoporate them into their posts.