One of my favorite parts of StackOverflow and the StackExchange family of sites is the feature to suggest edits to a post. It allows posts to become better and easier to read.
Would it be possible to add something like this to discourse? A forum user could recommend edits to a post. These edits could be only accepted and added to the post by the OP or a forum admin.
If a user sent a spam suggestion, it could simply be declined by the OP or staff.
there are many posts where images are posted as links, instead of embedding them into the post (link rot usually sets in pretty fast, taking a huge chunk of article context with it)
there are tons of readability features that casual users never heard of (e.g., collapsible/expandable section; I found out about this from the Prolog Discourse :))