I don't want any "new" stuff that isn't justified. (Things that were done in error the first time are fair game.) As with TNG, I mostly just want the show the way it was. Except I hope that when it comes time to recreate CG shots:
That the Defiant model is a better match for the physical one than it was originally.
That they do not copy/paste stocks shots as they were forced to do originally.
And I don't think a director's cut of "To The Death" is out of the question. As for other episodes, I'd just be happy to see some deleted scenes in the extras.