I like the 'modulation' idea. It explains the healing/regeneration difference rather well, I think.
I'm sticking to my idea, though, that if you regenerate/rewrite, you can only do so as a whole. So basically, what I'm saying is: He can modulate his body, if he can anticipate any future damage (can be subconsciously). If he can't anticipate, he's as vulnerable as a normal human to supreficial/short term 'injuries'. If the injury is serious, he has the possibility of regeneration to 'heal' himself.
oh, and about the newblood/oldblood - there's some more on this in the article about Gallifreyan physiology/ Anatomie. I only scanned over it, because of time-shortage, though, so I can't say any more. It's basically that some are born with two hearts, others only get the second one after the first regeneration.
no subject
I'm sticking to my idea, though, that if you regenerate/rewrite, you can only do so as a whole.
So basically, what I'm saying is: He can modulate his body, if he can anticipate any future damage (can be subconsciously). If he can't anticipate, he's as vulnerable as a normal human to supreficial/short term 'injuries'. If the injury is serious, he has the possibility of regeneration to 'heal' himself.
oh, and about the newblood/oldblood - there's some more on this in the article about Gallifreyan physiology/ Anatomie. I only scanned over it, because of time-shortage, though, so I can't say any more. It's basically that some are born with two hearts, others only get the second one after the first regeneration.