Search Additions - by expansion

While searching or browsing for videos, users should have the ability to make it so that the search engine only returns results of movies that were released during a specific expansion. Since we are getting into the 2nd expansion, this could help.

I could search Original WoW, or Burning Crusade videos, or videos released during the Wrath of the Lich King only.

This would also help if I wanted to search up say, mage PVP movies to learn some tricks, but don't care to view movies that were submitted pre-bc by level 60s...