I actually like ALT/LMB and don't mind if they incorporate things that were published as mods before, I'd also work on diplomacy, lord strategic conversation, better time - like (add 1-2 more campaign map speed options, like X8 and X12 time speed up, as current fastest is quite slow) and realistic weapons collisions - the swords, axes should bounce off from heavy armor, not cut through model, I think I used such mod in previous version, alliances between kingdoms.
Speaking of scenes, models, I think even redoing some already existing armors and giving them a bit life, or variety, belts, accessories, horns and release it as separate armors would be a great addon, not to mention armor customization with such props - that would be perfect. Troops are distinguishable between factions, but they look kinda similar. As of scenes, they slowly, but surely introduce one after another, I guess they have a decent testing pipeline, that's why it may take them so long. Village, castle and town clones are a bit painful, but I'm sure they know it and will add more variety.
I think they may incorporate some of the best and most accurate models and scenes from the incoming modding tools competition - this event is a 10/10 idea, congratulations TaleWorlds. Besides of great content to come, this will push forward modding scene a lot. I think in 2021 the game will really be something and the great mods will pop out, from Star Wars through LoTR, GoT, Witcher, Japan, Western, Middle East, Medieval world to native enhancements