Well I had an idea for a mod that would basically be the "Waterloo Mod" the idea is to replace all of the factions that weren't at Waterloo and replace them with ones that were. So for example replace the Austrians with the Netherlands and replace the Russians with Brunswick. And then edit the current in-game uniforms to Waterloo period accurate uniforms. And then have detailed maps of the different places on the map. We already have Quatre Bras, La Haye Sainte and Hougoumont, we could also add places like Ligny, the allied center ridge, Plancenoit, Papelotte, and maybe La Belle Alliance although I'm not sure if any fighting took place there.
Also I had an idea for a gamemode called "Linebattle Mode" where it would function very similarly to a conquest/battle mode but each side would have a "camp" where there would something like a baggage train or a camp where soldiers could heal and grab more ammo. Basically it would be a giant map and it could be played like this, one team is the "attacking" team and the other is the "defending" team. The defenders have certain points along the "lines" that they need to hold against the attackers, if all of the points are taken this basically means the defending army is routed and they lose. But if they manage to kill off the attackers before that happens then they win. An example would be to imagine a large Waterloo map. The defending team has to hold Papelotte, La Haye Sainte, the center ridge, and Hougoumont.
