Sometimes it's verry confiusing Thròr, you wrote by example:
...giving their arrows greater range and making them harder to hit
Alright, if this is true, why does your rules represent the opposite ?
Because, when following those, I should substract something of their range!
(So intelligent archers go up hills, wich is stupid because they're doesn't get any bonusses of it)
2) As Hithero already said, you wrote that humans may not use flaming arrows, what iq very strange because your pic shows a human who's firing a flaming arrrow
3) The Shooting Riders
rule is a good one, but you make a wrong comparatif; Riders of Rohan are the only cavalery who could do such a trick, because they're exellent riders.
4) I think you don't get the rules about charging and moving, your example of an Uruk-Hai who charges a Rider of Rohan would look in SbG like this:
Uruk-Hai moves his 6" towards a Rider of Rohan, but the distance is to far so he can't charge him in this turn
Shooting fase: the RR shoots him down
=> you see, the shooting and fighting fase just take place in a couple of second between all the movement fases
5) The only time I would use the Fallen Warriors
rule is in small doorways, bridges, castle walls, and so on => places where just a few warriors are able to stand next to each other
Conclusion: most of your ideas where great, but they still need to be worked out => they still doesn't meet my needs