Hey, Razor, good questions. I usually put the main characters (F/f), the main theme (humiliation, non-consent, etc), and then any crucial parts of action (bondage, spanking, etc). If there are any deal breakers (snuff, scat, incest), I'd throw them in too. I wouldn't necessarily worry about having too many codes as too few. I've been royally pissed with a few stories that don't warn me that I'm going to get bestiality or the ilk.

And Dixie Lass, consider opening the story the you want to check out in a new window or tab. Decide in the new window if you want to read it or close that out and return to where you were, without hitting the back button. That way, your search stays current and you won't have to go and enter all the information again.