Certain foci have easier or harder times at the lower levels in PK. Giving foci specific titles will basically paint a huge bullseye on some people, giving others an unfair advantage in choosing targets. You won't know what spec that warrior is, without at least walking up to him and looking or attacking him and seeing what he hits you with. I don't think we really need to handicap lower level shifters any more than they are already when it comes to PK.