I realise this is an old topic but for me I would like to see an expansion of the soft skills system, where perhaps you have multiple soft skills, medical, mechanical, butchery, gunsmith, tailor etc. This would mimic the existing system where as one skill increases all the other skills would decresse slightly.
Nothing based on giving advantage in combat such as strength or reduced sway on scopes though.
This could be hidden from the player or not but for groups this would encourage specialisation in skills and for lone players this could reflect their play style, if they live off the land they'll obviously get better at butchery but be more all round in general. I would suggest all soft skills reset on death though.
What if for example their were 11 soft skills and when one of these raised 1% all others would reduce by .1%