pocketguild (need more features!!!!!)

for this plugin... I need a feature that gives you more maximum health
everytime a player joins a guild which means if there is 1player in a
guild called miner the player's maximum health in the guild "miner" will
go up 1 so becomes 21 and let's say three people joined... then the max
health will be 23!!! but it MUST only affect the players in the guild!!
maybe Sekjun can do this... or if he is too busy then omattyao should
add this feature!!