There should be no reason why the shields should be able to recharge whilst in AL (that is, towards the end of a full usage cycle). The fusion pack in the armour has enough to handle as it is... *shrug* To that end, I think we'd see less spamming during regular combat if they nixed that particular bonus.
Shields recharge while in AL?! I thought bungie said that wasn't the case, at least around beta time. (Don't play CMP in Halo enough to realize this).