Directed Gamerules

WIth the addition of the 3 new gamerules relating to certain damage types, it would be beneficial to make these be able to be toggled for certain players. For instance when a map maker or roleplay server owner has certain classes, a mermaid for example, they could disable suffocating damage for those players. Or a dragon class, fire damage could be disabled for them. 

The command could be run as normal with the addition of the player's name. /gamerule PlayerName drowningDamage false. Or perhaps a new command, something like /playergamerule (/pgamerule).

I'm sure other more creative players can think of more uses for this, but I believe it would open a whole new world of opportunities for content.