Any good ancillary mod (which adds control functions but does not otherwise change the game) should be incorporated into FAF itself, IMHO. Thus EcoManager and the new UI should be incorporated with set-up buttons to allow or disallow them in custom games. For the ladder 1v1, I would like to see the EcoManager enabled as part of standard FAF but it should be an upgrade. ACU's should be able to run an EcoManager upgrade which enables eco management. It would have to be decided what this upgrade should cost and which slot it would go in.
The general principle is this. Early in the game a player has time to micro eco BUT later in the game it would be good to relieve the player of eco micro to concentrate more on battles. That's just my humble opinion as a low rated player.