The 1upt design decision has always been controversial. There is a mod available that allows multiple units per tile. But the problem w/ it is that the AI can't use it. It continues to plod along at 1upt. So we only get a taste of the potential improvement. We need a game revision that frees the AI and gets it to play at some multiple: 2upt or perhaps 3upt. It would be nice to have a mod that allows n-upt, where n is set by the player, but I'm assuming (intuitively basis Murphy's Law) that that would be too ambitious. That's because I'm assuming that any mod dealing w/ this issue would also have to tinker w/ the AI's algorithm for tactical and strategic combat. Gosh, it sounds more daunting as I write this. So maybe this would need to be a two part project? Change the maneuver/stacking mechanics, then upgrade the AI's tactical/maneuver intelligence. I really don't know whether any of this is feasible. But I would like to make the request, and perhaps get a discussion going on what it would take. I do believe that the potential for improving the game, improving its variety of game play options, thus expanding the player community, is substantial. I also hold the opinion that we will not get the civ6 AI quality of play to a level comparable to what modders have done for civ4 until we get the AI liberated from 1upt. I have no programming skills that are up-to-date enough to matter, but would be glad to help w/ any grunt work that might have to be done.