When number 0 is specified in the config the bridge will send out a signal to all connected zones. It would nice nice when the entry with number 0 is clicked all other zones will update to an on state.
I don’t think that is possible because LimitlessLed component doesn’t know the current state of the lights. That is the main reason I switched to Yeelight.
P.S. Correct me if I’m wrong, perhaps my information is outdated. 
Yes that’s true. But its state is saved by home assistant (correct me if I am wrong). So when it recognizes zone 0 het been switches it could also update the state of all connected zones without calling the api.
So it can be like, well whatever the previous state of connected zones 1 to 4 was it’s now the same as zone 0.