Why exactly are you trying to do this? It is a bit concerning that you dont have access to delete users but are talking about disabling them.

You also ask about adding users which you should know how to do if you are doing stuff like this. But want to add the type of user (AD) that you say you want to disable; and are now talking about cluster service users.....

Be very careful you know what you are doing and have authorisation otherwise your future might not be so rosey.

What exactly do you want to accomplish and why?