Yes, centralised. That's the model that works for software development. Where would this voting nonsense end? The alternative is to make development "equal opportunities", anyone and everyone gets a turn at designing and patching! Have fun with the coin you end up with using that development model 
No, you're free to operate and mine on whatever client you want. If you're forked off the network, it's your fault.
Not the user decision. That's not centralised. I didn't say that. I was talking about the development process. Not mining. It contributes to meaningful discussion if you read what you're replying to.