About special abilities for units – I actually think it is historically correct and improves the reality factor of the game.
For example, can you imagine such unit as naked fanatics forming testudo formation? Or german night raiders forming phalanx or wedge formations?

Actually, the special abilities reflect exactly the way each different unit was trained (if at all) and fought a battle those days.

So I think it is very welcomed feature. It is much more realistic and puts additional tactical depth to the game.

And about warcry before charge – I don’t think you will have to click on warcry over and over again during one battle – I hope this ability could be used only once through the battle.