3switch between combat 1.8 and 1.9+

Hi, I'm Eder, I'm pleased to share my idea, which would be the following, I could make a switch or button in accessibility or when creating a new world to choose the type of combat you want to use if it's 1.8 or if on the contrary it's 1.9+ now that some people like me like the combat of 1.9 and I would not like this option to be removed, it would be in a tie for players of pvp 1.8 and 1.9 thanks