I've never allowed dodge. Parry and block, yes, but I have not seen many examples of someone dodging a determined & trained attack in RL to consider it viable.
This is the hard part - with hit points and called shots. I don't know how GURPS treats it, but I know how D&D and Savage Worlds treat it. Real people don't take Damage, they take Wounds*. And not all wounds were created equal. It seems to me that any damage to the throat (greater than the minimum damage) is a life-ending event**. Vein-dead. Artery-dead. Spine-mostly dead. Trachea-dead, unless a surgeon does it. Anyway, Savage Worlds addresses the above-mentioned 4e bag of hit points problem by reducing everyone's health to three Wounds. But does that mean the neck can take three wounds before death? In D&D, neck damage gets lumped in with damage from everywhere else. Mythras - lumps neck damage in with head damage?Slit someone's throat, the damage that penetrates reflects what would happen.
Mythras - lumps neck damage in with head damage?
I suspect people are thinking of something like this:
"Muhammad Ali Dodges 21 Punches In 10 Seconds"
Aha, as great as Ali is, Dokes is only going for his head, he's not trying to, for example, kick him!
From what I've read, the dodging trope has come out of RPGs, and not out of any practical martial art, perhaps the idea is influenced by Errol Flynn (who actually parried quite a bit) and swashbuckling movies. You can include a certain amount of footwork and leaning into a parry action, but the idea that you can completely use "dodging" in a close combat melee is complete fantasy, which might be ok for your game, just depends on what your sense of verisimilitude is.
I wasn't arguing, really, just pointing out what people were probably imagining. I don't really have much of an opinion on the topic--not enough to rewrite mechanics over it, anyway. If a game divides making contact from doing injury, though, you could plausibly consider rolling with a blow to be mechanically similar to dodging.
This is the hard part - with hit points and called shots. I don't know how GURPS treats it, but I know how D&D and Savage Worlds treat it. Real people don't take Damage, they take Wounds*. And not all wounds were created equal. It seems to me that any damage to the throat (greater than the minimum damage) is a life-ending event**. Vein-dead. Artery-dead. Spine-mostly dead. Trachea-dead, unless a surgeon does it. Anyway, Savage Worlds addresses the above-mentioned 4e bag of hit points problem by reducing everyone's health to three Wounds. But does that mean the neck can take three wounds before death? In D&D, neck damage gets lumped in with damage from everywhere else. Mythras - lumps neck damage in with head damage?
I suspect people are thinking of something like this: