I think that would be cool in a update in the very far future! The attack damage, speed, and range would mean an overhaul to the current combat system, because one of the effects of even the basic hits the characters have is "knock-back range". Essentially, when we hit the zombies, they stumble backwards, and usually out of range of a second attack. It's a well done balance to keep us from being overloaded with zombies all at once, however, to implement like "high attack power"; "fast attack speed"; and "wider attack range", would mean reducing or getting rid of this mechanic, which is currently an essential part of the combat system so far. Like... if they have "fast attack speed" we would need the zombies to not be moving away as far, in order to hit them again fast.
It's a very neat idea though! It will just take some time to put into the game, and probably a long while.