Imagine this. You have a person going around slamming a gigantic bastard sword at you. You get caught in your chest, flat side against you, and you remarkably are unhurt. You should be:

A) Stunned momentarily
Walking around acting as if nothing the size of one and a half faelings slammed into you.

Could it be possible to make there a chance that you will get momentarily stunned if you get slammed with an axe or a greatsword?

Pureblades jab anyway, and attacking flat-side would make no sense in terms of offense. As for Axelords - they already have such an affliction! Hell, it even breaks ribs, causing a minor endurance drain.

EDIT: From the wiki.
BreakChest - Major wounds to the chest's ribs.
Fracturing the ribs of your opponent will briefly stun and reduce endurance.
Requires heavy wounds for bonecrushers, light or medium for axelords. Good alternative if the enemy parries the head too much.

And if you are asking to have a non-wounding dependant attack which would cause only stunning, but not damage or wounds - it's called Headslam.

Also, 4 new topics on the same thing - bad. I know it's probably due to lag though. Can an admin fix this?

And another fast stun is shield reposite. What I am talking here is when you are hit by a greatsword or a axe, you have a separate chance of being stunned.

We have enough attacks floating around in the various skill-sets that stun. I am of the opinion that stun, along with blackout, are a bit overly done in this realm. I would rather have more control over what I afflict a person with or how my poisons come off my weapon, than to have a chance to stun tacked on to each of my attacks. The former allows for more thinking on my part when it comes to creating tactics, the latter just adds another randomized effect that can turn the tide of a fight without any effort on my part (ie.. Troll stun in Achaea).