I don't think there's anything on the hardware end that can possibly be done. In any other MMORPG, if you tried to move while casting, and assuming you're not supposed to be able to do this, your spell generally gets interrupted immediately. There's no reason for your client to even consult with the server, because the client knows how to resolve this. Even if you're disconnected from the server, you can generally still target someone, cast something, and then interrupt it by moving until you get kicked off the server. There is no way your client can even communicate with the server (you're already disconnected) but it still knows it can interrupt your spell when you moved. FF14 obviously does not work like this. Your client absolutely has to consult with the server first to interrupt your spell, and that's the root of the problem as your client cannot use information it has to make a call, even though it surely knows you moved long before the server does.