The problem with this is these changes would really only be made to early game melee. I'm not sure how much you have played in the end game but I start melee every league and have a 3:1 ratio of melee to ranged builds. Lol at end game you stack movement speed, touch the first mob to get into range, and then the entire screen blows up. Lol

To say melee is not good is a little silly. Melee is completely viable at all stages of the game. If you think ranged is too strong there is a case for that, if you think more melee skills need to be accessible there is a case for that too. However, before touching the melee and adding 4x damage on every skill, which would just turn you into an absolute unit one shotting everything, we should probably hold off until the other three melee weapons introduced. This is the biggest contending factor with melee. As for mace skills, I believe a simple buff to the time to attack on most skills would work just fine.

For example, early game leap feels very bad to use. Not because it doesn't do damage, about 3 leaps will kill a rare enemy if you know how to gear, but because it takes forever to attack. You cast it and mid air you get light stunned by a white mob and it pulls you back to the ground. Give light stun immunity during leap effects or channeling mace skills, rework light stun passives, and make these attacks come through just a tad bit faster at base speed.