Another thing that would be interesting to see in TOS (or pseudo-TOS, or whatever) would be warptugs. I envision a Federation interstellar backbone of freight-bearing ships (and passenger-liners) being tugged on spacelanes between worlds and space stations to keep personnel, equipment and materiel commerce flowing, as well as for exploration and colonization. In 2008 I started a discussion on this subject, and there were some interesting ideas on what Federation (and civilian) warptugs would look like.