I see... I'm not an Expert in Animation but I do know something, so, I'm happy to help. I'll start from the first one, so should I only improve the animation file I downloaded or I should add animation using this reference https://www.youtube-nocookie.com/channel/UCeK9WgRPUD5eOVZW-fCFBYg (I suppose), if it is the second one, should I randomly choose pose and movements or do I have some more indications?  

Really interesting project! KEM is a creative approach to making programming more accessible and inclusive for learners.

If release then likely fixed in git already.   Real bug, the dropdown getting in the way is sort of ok, not great for sure, showing wrong description definitely is not, also some description don't even fit in the tooltip region. Please file a bug on gitea.   If in release then likely fixed in git already.   Walls don't prevent attacks, just movement, this is no different than arrows.   If release then likely already fixed.   For those I sad likely fixed would be nice if you could try to reproduce on main.

Well my proposal was adding a mod say aoe-shortcuts with just a config/mod.cfg but if you want to go the programming route, you can also bundle a json with a GUI change that gives you a drop down to switch.

Definitely useful. Your approach is smart JSON diff plus user. cfg keeps things clean and avoids engine changes. Just make sure there's an API hook so other mods can interact with the presets easily.