I mean like you would create a group, so for example if I highlighted 20 Spearmen and 10 Swordsmen and made them into a group, then I could make about 4 of these and line them up with easier control. What i mean by this is that you wouldn't have to keep highlighting the units you could just click e.g a banner at the top right of the screen. Maybe when you grouped a general and banner would appear boosting morale? Or perhaps you could train a general and merge them into a at least a group of 20 units and any you units you added to the group would get a boost from this general/captain whatever!