It would be helpful if you add collections to search results. If you have a few hundred collections, it become a chore to find what you are looking for by sorting through them manually. The same argument could be made for Genres, specially with genre cleaner plugin and Emby's ability to handle custom genres.
Optional: If polluting the results is an issue then perhaps a search syntax could be added that you can type in the search box to make the results more specific. example;
- collections: search-query (only returns the results from collection)
- genres: search-query (only returns the results from genres)
- custom-media-library: search-query (only return the results from that specific library)