Orcs Scary Shield Upgrade

Is there no way to include a hero in a unit of orcs with scary shields and them still benefit from the upgrade.  Maybe I overlooked it, but unlike the spear/phalanx upgrade I don't see an option to equip the hero with a scary shield.  Wondering if this was an oversight or intentional?  I expect one might unbalance things if the -1 to hit was combined with a powerful mount upgrade.

Thanks.