I gave an example earlier with "Crack the Shell" - an attack that deals damage an imposes an AC penalty. Can you honestly not think of a literary example of this?
Or, if you want a real world example - Half Swording where you grip the blade of the sword and thrust it like a spear - extra damage attack, and probably turns the sword of any type into piercing damage. How would I model that?
Are you honestly saying you can't imagine a stunning attack with a maul or a mace? How about a simple knockdown attack? Where I actually deal damage AND knock something on its ass instead of giving up dealing damage. Heck, you mention Conan - how do I reliably throw my sword? That's certainly something that's done in genre fiction. How about a Stop Thrust - where you "counter thrust attack into the opponent’s forward movement or oncoming attack" to stop someone's movement toward you. A fairly simple manoeuvre that reduces a target's movement to zero for one round and still deals damage.
These are all things you can't actually do with a fighter.
Why would you want something as limited as Crack the Shell when you can play 3E/Pathfinder and have Sunder? Or Stunning Attack? Or a martial arts style? Or Intimidating Prowess that allows you to use the intimidate skill to scare demons with a glare? I had a Fighter in high level Pathfinder that started down a demons and dragons he was so damn intimidating. They called him The General. He gave a command and no one questioned it. His entire persona was one of fear and discipline. No one could withstand his intimidating glare except a paladin with immunity to fright.
All the things you seem to be asking for were created in Pathfinder and expanded on Mythic Adventures. Why do you think my group loved Pathfinder more than 4E? Because you could create this amazingly versatile and powerful martials. The majority of my group prefers martial characters or some kind of martial hybrid. They had tons of fun making characters in the Pathfinder system because it added so many options over even 3.5.
I took care of limiting spells on the backend to ensure the caster-martial disparity did not affect spotlight disparity. I don't like casters usurping what I've designed martial characters either. I always had one player that liked to play casters trying to take out the enemy I designed for the martial characters because he figured he had a weak Will save. I made sure that didn't happen as a DM because it's annoying. When I create a martial enemy I want to see that mano y mano fight between two badass martials play out. When some annoying caster decides he wants to interfere, I take care of that as a DM with a magic item or buff or an enemy that gives that caster no time to spend on some other enemy.
If you want a badass martial, take a look at Pathfinder. It's a far better system than 4E was for building an amazingly versatile and badass martial character. Even when we switched to 5E, my martial loving players had ten or more concepts for martial characters they still wanted to try after already having tried just as many.