Stock sorting options?
Solution 1:
DFHack can add search option to Stocks screen, see dfhack#search.
The search plugin adds search to the Stocks, Animals, Trading, Stockpile, Noble (assignment candidates), Military (position candidates), Burrows (unit list), Rooms, Announcements, Job List and Unit List screens.
Solution 2:
You can use my Improved Stocks Screen plugin for DFHack r3: http://www.bay12forums.com/smf/index.php?topic=125164.0 that makes it easier to find what you're looking for.