@ Arralen,
I always appreciate reading about someones ideas, so your one too ^_^ But as you ask waddusthink, excuse me but I think this wouldn't make sense. A Wyrm with 900+ hitpoints running away for a scratch got from a lucky slinger?
Seems unthematic - what kind of useless high-hitpoints SCs would those be? I want my commanders and heroes to fight epicly to the bitter end for me! And why really a commander would run away for just a wound? And why soldiers don't so too?
I think i.e. flyers would become extremely overpowered also - they attack rear and if they start just scratching the even most powerful commanders, all the huge army routes?
I think the way it works now is ok as it is, with routing and fear and morale mechanics and all that stuff.
just my opinion of course