The horse archers thing is unappliable as stepe factions basically have HA... Also, I think that if the player with HA would be forced to charge after they ran out od arrows, it would make the game fair as the HA (outside armored ones) would get slamed. The 3rd point is unfair cause if you want to limit those guys, then you'd have to limit Agriaspidai Thorakitai for AS, Dosidataskeli for the Lusotanan, sword masters for Casse and a lot of other units... I believe those units are ubber expensive (the first battle I made I fielded 2 they did a good job but I ended up numerically outmatched by nearlly 300 units on large.
So, it's up to the players do they want to field large numbers or smal numbers of really tough infantry?

Cheers...