Would you be able to switch a player to R15 (without setting options when publishing the game) So like:
game.Players.LocalPlayer.Character.Humanoid.RigType=Enum.HumanoidRigType.R15
Would this be possible
This is currently impossible as far as I know. I've tried this about a million ways to make sure the character stays alive, although this doesn't work. Roblox might possibly add this in the near future.