I read somewhere that by changing combat ability to 64 you can give to a unit a volley attack like kipchaks. It’s not the same as adding arrows to shoot one after the other, that I can do (add max projectiles) but the volley thing doesn’t seem to work.
The flag to use should be 16, not 64.
Ok 16 works but you need to add maximum projectiles and total projectiles too. That I didn’t know even if now it seems obvious!