That may be a bit harder to make. It's easy to program the map to have allied vision from the start. I assume DE does a similar thing to what we do in old AoC to achieve it, add the command in the generation of the map.It really helps when playing TGs without a pre-made party. I might have preferred it to start after the TC goes up in Nomad. But overall I think it's a good change.
However, linking it to the Town Center AND allowing the old behaviour at the same time may require some programming. I know a way to do it but it takes a bit to reprogram the game.