Much as I would like to see everyone mortal, we're never going to force that on characters that weren't created with that in mind again.
I do have on my TODO list to add a checkbox allowing any character to opt into mortality.
As for rejecting duels, I understand where you're coming from, but I have seen so many duel challenges that were both totally frivolous/spurious and to the death. Why the hell should I risk the life of my character—who has not spent months training sword skill—just because some rando I've never seen before who happens to be in the same region wants me to?
