-Using Smallbows on a horseback riding archers (maybe after cavalerist)
-changing how the solider holding the shield
right now you cant protect with the shields your head or your feeds (towershield) when the enemy is above or below you.
An option to change that, when you look down the shieldarm can lean forward so that the lower point is fixed and only the higher part of the shield moves forward with the shieldarm. The same when you looking up there the lower part of the shield moves up and the higher part of the shield just moves a bit above the head.
right now as an shield user its sometimes more luck than skill. And against arrows its absolutly cancer cause arms head and feets are not coverd effectivly.