No, adding a new skill isn't possible as it is hardcoded.
Chi si ritira dalla lottaE' un gran figlio di mignotta!
I preemptively apologize for bringing up others fallout games but if I remember correctly the developers of the Van Buren Project merged several skills together to make them more appealing/functional. If we follow that example we could decide to merge skills like melee and unarmed, sneak and steal, science and repair, speech and barter, and or other interdependent skills so that alting isn't necessary to be able to utilize different play styles. Right now I doubt there are many people who would create a character with some of these skills tagged without planning to make alts to fulfill other needs/wants.
Technically we are arguin' in what skill placin' bow, and to do that we need to mess up a little with skills. Plus, we took the occasion to bring also other skill problems... so arent TOTALLY off topic.