>I'd make three limitations.
>
>1) I'd make it have an affect that disallows inherent flight
>until the object is removed manually.
>
>2) No wingsweep.
>
>3) Wear/remove on the about body slot causes lag.

With some minor edits, this was my first reaction.

>3) Make it such that when they spread their wings with the
>object on it falls to the ground.

Nah, there would have to be something of a deterrent.