Heres some suggestions for Immersion, unfortunately these suggestions would take time to create but hey ho they're suggestions:...
1. Trebuchet custom model with animation rigging (We all know the reason though i expect it would be difficult and the Rise of Mordor team are planning on making one for their Gondor Faction)
2. New charging animations, maybe with swords above heads for sergeants and dismounted knights, very reminiscent to Medieval 2

3. Better ranges for ranged units, something Attila lacked and would spice up game mechanics!
4.Custom animations for maces and weapons that act like swords in vanilla?
5. REDUCING MOVEMENT SPEED IN BATTLES. In Attila most units are farmers, and its so very fast paced! My suggestion is to reduce speed all over the board, including Heavy knights.... Bring back factors that made Medieval so successful with Attila's improvements and... not-so-improved-bits... (Looking at you Unit Collision)
Yeah these are intense suggestions, sorry, I´m just excited, dont take it the wrong way.
I know these things could be added in submods, but was wondering if it was planned for the base mod

Everything looks great atm so good luck and great work so far, particularly like the banners being reintroduced! Rep+