This threads gotten rather far off track, but I'll just mentioned that I took out the season four Blu-ray from the library again, because I didn't have enough time to check out all the special features.
It's clear that, for all the cast and crew, the writing was on the wall for the fourth season, despite Enterprise being UPN's highest rated show. The that that it was banished to Friday nights for its final season and cancelled just before a new standard of ratings would be introduced seems like a strange case of history repeating itself.
Apparently there were two signs the show was on borrowed time. The funny one is when they took away the $25 a day bowl of fruit in the writers' room.

The not-so-funny one is that with the recent loss of the space shuttle Columbia and the show about the depict the launch of a new ship named Columbia, some of the NASA astronauts wanted to shoot a 30-second video basically saying "Godspeed, Columbia" to air before an episode, and the studio couldn't even be bothered to get the clearance to put it on.
We also get an interesting 90 minute reunion discussion with Braga and several of the writing staff: André Bormanis, Mike Sussman, Phyllis Strong, David Goodman, Chris Black, and JGRS (sorry, no Manny Coto, though he did do some interviews for the disc).
They don't really get too much into specific episodes (apart from a bit of Goodman freely bashing the magnum opus of his that is "Precious Cargo"

). It's more about their own personal experiences. Braga notes that he didn't really work with the Reeves-Stevens, because he'd pretty much turned the reigns over to Coto by season 4. None of the writers were really prevue to the struggles that Berman and Braga had with the network.
They mention that people are coming to appreciate the show a bit more, now that we've been without any Star Trek on TV for a decade or so, which makes sense.
It's worth checking out if you can buy, rent, or borrow the Blu-ray, I think.