Correct me if I'm wrong but ready check only occurs if the party initiates it doesn't it? I know I have yet to see it myself and I've done a couple things in duty finder since it was added.

That said, I really don't see why you would want to disable it unless you're planning to go afk and don't want your party to know about it when they initiate the ready check. Some people don't read chat, this feature is a good way to get their attention and I'm glad it was added.