How is it the Directors Cut if the director of the film didn't work on it?
It'll be the Director's Cut if Shatner signs off on it and says "Yup, that's pretty much what I would've done." It'll be about as much a Director's Cut then as the 1992 version of Blade Runner
was (Ridley Scott provided notes/tips, but didn't oversee it himself). Otherwise, it's just a Fanedit. Either way, Paramount won't touch it on sheer principle. Or they'll simply shelve the only copy and only release it on Blu-Ray when Shatner (gulp) is no longer with us.