Item 1, pining posts is delivered
Item 2, adding option to assign a posts to specific group or topics at the time you are posting the content is in progress. Will be released soon.
Item 3, adding answers to search results is on our roadmap
1. 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).
2. 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.
3. It is 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.