I'm not exactly sure what you're saying, Rob, but to break away from CT's task resolution is to break away from CT, as opposed to produce a version of CT.
Task resolution is the center of a role-playing game's rules set because it defines how the game gets played as opposed to merely read. Just look at people's strong responses in this thread.
Except that T5 is NOT a version of CT, and (at least I, and I'm sure Marc, and from what I've seen, many of our forum members, would say) T5 is NOT a version of T4 either. It's not T4.1.
T5 is a new version. It uses a version of the T4 skill mechanic because that's where Marc's head is at (Is that Marc's design? I don't know. It is where his head is at. Those could be different.) I can say that the ACS ship mechanism is certainly NOT QSDS. And he's at least listened to Ken Burnside on some issues regarding ship design. I respect Ken a lot -- may not agree with him on some things, but he's thought more about those issues than anyone else I've spoken to face-to-face, and done the research. Marc might not use any of his suggestions, but Marc is researching and listening.
T5 is still in Traveller's future, but I think I can publicly say it's much closer today, on Thanksgiving weekend 2008, than it was in March of this year, or September of 2007. And what T5 can become now is quite different from the T5 that would have been in 1997 or 2004. And I believe that wait has worked out for the best.