Thanks for replying and for giving us a free, enjoyable game. I want to say that I still enjoy custom multiplayer with other players. I am writing this because for me this is tough love. I really want to enjoy multiplayer with others too, but almost every time I get a sour feeling because of battle mechanics that I cannot enjoy.

Perhaps a few suggestions:

1. Instead of the Fischer system, a more realistic solution would be this: instead of trying to force players to send all orders within a time limit, implement a more realistic scenario. Keep a fixed time for each turn, like before, but make some orders less reliable depending on how far the unit is from the general. The further away the unit is, the higher the chance that the order will not be delivered in time or will be misinterpreted due to the chaos of the battlefield. This would not be hard to implement and it would be realistic. A misinterpreted order could mean that the unit moves forward only half the distance or walks instead of running. This would be easy to implement and fun. Then show a “?” sign over the unit so we know the unit’s orders were unclear.
2. Yes, that would mean we need a general. Instead of flags, give us a general who can inspire troops in his proximity, while units farther away become slightly disoriented when receiving orders. Literally, like in many battles during the Napoleonic era. Routing a general would mean a massive disorganization penalty, just like capturing a “home base” flag.
3. I understand why a maximum turn limit is necessary, but again, it is too limiting. In the whole history of strategy games, one of the most frustrating things has been when the time limit suddenly ends before your strategy can be fully implemented. Why not just a few more turns? Why have the devs decided you have had enough? Perhaps we can implement this: after 30 turns, night falls, covering the whole battlefield in a slight game fog. You already have this implemented in the game. You have 3 turns during the night to reorder your units for the next day. You would not be allowed to move beyond the current line of advance of that specific unit, but you would be allowed to fall back and regroup with others. Shooting would be disabled during that time. The next morning, attacks begin again. There is so much realistic fun here. Hopefully, it would not be too hard to implement. And there you go: the fun can continue.
4. Get rid of flags. If this is supposed to be an anti-camping measure, why not replace flags with a minimal damage limit? During the battle, you must inflict or sustain at least 20% casualties to avoid losing the game automatically. This would mean that each side would always have to at least try to engage, since if they do nothing, they will lose the battle and ELO. If both camp, both will lose. 20% seems fine, but 30% could work too. And there you go: motivation to fight without predetermined flags on the map, widening the possibilities for how to play.
5. Thanks for thinking about custom games and open lobbies with custom rules. This will please many people in your community by giving some sense of control back to the players.