About the horse archery thing from Pendor, I think I know,which one it is. I've tested it and it works very well (raising horse archery skill on troops never hurts either), but it requires some fine tuning of the values that control speed and distance to work properly
When I implemented it in my homemade module, the horse archers would just trot instead of actually galloping or at least riding fast, and they would both circle too close to my troops, and take too long to evade them if they approached. I can't remember now as it has been a couple years, but after working on some values used on the calculations, it worked very well, and suddenly Khergits were very deadly. Something about a wheel of archers surrounding you while a wave of armored lancers crashed into your army was just terrifying to watch