(parity between Java and Bedrock) add options for some differences

I'm referring to a way to achieve parity between Java and Bedrock. I mean, for example, in combat, when creating a new world, you could enable or disable "cooldown" in the options, or with the Wither, you could set the Bedrock Wither to hard and the Java wither to easy or normal, or things like that for the topics discussed, But in the case of servers, we can add a command that says "coldown" true or false, or something like that. I don't know much about commands or programming, I just wanted to share my idea.