For ENT, I would work within the established network constraints. Rick Berman still had a balancing act to do.
1) The UPN sale of 2006 is inevitable.
2) The Temporal Cold War must stay per the network.
Thus, I would move all S1 episodes pertaining to the TCW to the first half of the season and move all S2 episodes pertaining to the TCW to the second half of the season.
The Xindi Wars Arc gets moved to Season 2.
I would split Manny Coto's three part episodes into two seasons.
Those pertaining to the Romulan War are front loaded. Those that do not stay in Season 4.
Thus Season 4 is the Romulan War.