Mace Strike - Propose "Double Swing" Support Gem

I would like to propose an idea for a support gem called "Double Swing" that takes the Barbarian skill from Diablo 2, and converts it to a support gem for the Warrior's Mace Strike skill. When triggered, it would double your attack speed by striking two enemies at once. Exclusive for one-handed maces.

Double Swing
Support, Attack, Melee
Requires: One Hand Maces
Supports one-handed skills that Hits enemies, giving it a chance to strike two enemies at once (or one enemy twice, if only one enemy is in range).