The ability to pin a post to the top of the home page & topics. This is important for example, if we want to host a AMA, feature specific posts, or make announcements (other than the main announcement).
Also, another thing I noticed is that people don't use topic tags. Instead of posting in the specific subtopic that is pertinent to their questions, they will post in just the main forum & they will not label their posts with the correct subtopic. Not sure what the best solution to this is.
Also, it's hard to do searches because it doesn't show you a list of results like Google does. Either the keyword you are looking for is mentioned in a question, or it will not return search results. If you search for a term that is mentioned in an answer but not a question, it will not show any results.