I've not read the novelisation of TND by Raymond Benson, but one comment in my future super henchmen thread mentioned that in the novelisation, Stamper has been portrayed as being a masochist. Now this is something interesting, and I wonder how it would've played out on screen. It would've certainly made the most unmemorable Red Grant clone much more colourful. I imagine Bond hitting Stamper repeatedly only to realise that the latter is actually taking pleasure in it.
In the same thread, it was also mentioned that Stamper was actually supposed to be immune to pain, but then this trait was cancelled and hacked on to Renard in TWINE (even here, we hardly got to witness the full potential of this incredible trait).