Mace Rework

The new item presented by Mojang has left a lot to be desired among the Minecraft community. Its main idea, although striking, lacks functionality and falls on the situational.
My idea for its rework is very simple and even more striking:
The mace will have a charging time, the more charged it is, the more damage it will do; but if used when fully charged, it could stun the enemy for at least 2 seconds.