Toggeable Combat!

So, we have a split in the community. There are the player's who like 1.8 combat and players who like 1.9 combat. We know a combat update is coming soon, so it would be great to be able to toggle between 1.8, 1.9, and new combat! It would get combat players playing on newer versions instead of just sticking with 1.8 for the combat because it's toggleable. Maybe if you use 1.8 combat mobs have more health and 1.9 and beyond have default health. Please add this to the game it would please a lot of players. Thank you for your time.