Is there a way to sort on 2 fields?  For example sort by tag, then by title, or sort by genera, then by title.  This way the collection groups all generas together and lists the titles in that genera in order?  Thanks!

The only way I can think of is to use filters to narrow down your collection. Then any search that you performed would only return results from the filtered collection rather than the entire collection.
For example, if you only wanted to search for a title directed by Alfred Hitchcock, you could use the crew filter to only show the Hitchcock titles in your collection, then search for whatever you want within that list.
Is that what you were after?