I have had a good few kills with the shield while charging, it hasn't once refilled the charge meter, broken or by design... who knows.I don't think it does, melee kills while charging still counts as a kill while charging and valve also added that kills with the shield itself also refills charge meter.
That would be an ideal solution, the boots have never done much for turning speed, the splendid screen would be downright awesome with that kind of turning ability.I think nerfing the shield by removing the turn speed and buffing the boots to that godlike turn speed is the way to go. Even though it kind of makes sense with the shields design.