I know the subject has been brought up several times but it is time to bring it up again. Players need to be able to take control of their own siege at any time. Common sense means players need to get off siege between shots (heal, clear dots, etc) and while you are off other players constantly jump onto siege that is not theirs. Most MMOs I have ever played that have siege the player who owns/drops the siege can take control even if another player is on.
So once again, please ZOS players need to be able to control their own siege.