It's hard to put this down to a single feature request, but far and away my biggest pain point using Soundsnap is with searching. Some ideas I had for improvements are:
- Prune low quality SFX from your library. Sometimes less is more.
- Allow user ratings on SFX.
- Sort your search results based on popularity and/or user ratings.
- Allow refining/exclusion of search results directly from the search results page (I'm aware of the advanced search page, but allowing refining right from the search results page would be a time-saver).