I did think the English longbowmen got rather short changed when it cames to arrows in MTW. In big battles, they would be resupplied and so have made a more sustained contribution. But trying unlimited ammo vs the AI makes the game rather unbalanced, so I won't protest.

I would like to see some representation of supply on the campaign map. I think it would add to the gameplay if you had considerations like cutting supply lines or the difficulties of foraging. At the moment, there's lots of interesting tactical choices on the battle map but the campaign map is rather simple and needs spicing up (ambushes were one step in the right direction, but are still fairly rare). Losses due to attrition would be another related thing that should be added.