One of the supposed features of 4th edition I was very excited about, was the idea that weapon choice would be meaningful. While what weapon you wielded certainly did have some impact on the game, I personally wasn’t pleased with the direction it took.
Just like folks do not enjoy seeing bad feat choices, I do not like seeing weapons that are never taken. Each weapon should have something it brings to the table that makes some one seriously pause and think, “Which do I really want to go with?” Because of the way the economy moves, price isn’t really a motivator at the moment.
For the martial types, I think this feature should be evident out of the gate. It should not require a feat, or a specific power choice to make the weapon more effective. In fact, I wouldn’t mind seeing the “attack power” something that is stitched onto the weapon itself.
The very basic idea is that all weapons would have standard effectiveness no matter who is holding them. (+ to hit, dx damage, etc) The description would have a side bar, Martial: Weapon attack – Hit: target is knocked prone, do attribute damage. Make rattling a feature of maces, Martial – target grants combat advantage to all melee combatants till end of next turn.
The sidebar could even be class specific, giving rogues, rangers, and fighters options with weapons that other classes wouldn’t have.
Maybe the benefit is something as simple as “+2 to prone attempts/disarm attempts/immobilize attempts, etc;” whatever works within the new mechanics.
Not very fleshed out idea at the moment, but I think you get the idea.