@Devilize i do play only with one shield, but i wouldn't take away the freedom to choose which playing style a player wants. Keep in mind, carrying an extra shield makes you damn slow, they cant just run away, they are more like walking walls behind that an archer could hide.
If you take away this, i would also consider to only allow one type of weapon to carry, either your an archer or your not, youre a pollguy or a 2h swinger or you throw stuff, but no hybrids, that would be the logical conclusion to me, out of your suggestion. If restricting an allready not very strong playstile in context of k/d ratio, then restrict others even strong too. Would you like that?