My rules are:
no time limit
game to 1xx points (but you need to 2 points more than opponent to win a game)
one more player on the field but not higher than 185cm.Task?Saving balls outside the field.
even lighter ball (for men only) to make more rallies
more points for:
ace - 3 points
block scoring - 2 points
back row scoring - 2 points
2 touches scoring - 2 points
no subs limit but no special break to do it as well - can you imagine digging from the sub zone?