It'll be implemented later. Later.
You should know that firstly "adv. mode" was a surprise and just a nice addition to the game. The main thing was Fortress mode.
I don't think it went too far from what it was at the beginning.
For now the mighty Toady One is developing the Arc release, which will contain wars and massive armies. There your adventurer will see much more fu fighting in the big mess =).
And "cosmetic" things will be implemented much later, I guess. Anyway the game updates quite often, and there's always something new and interesting the Toady can show to us.
You see, the developer has a clear plan with some hidden (for us) elements and he walks this path, and it's much better than "err, what should I add next? Pressure points? Scars? Maybe red small berries which are seen only by eagles?" He's the man.
And you can mod something by yourself... For example, there's a wonderful Martial Arts mod around which is under constant developement too and also introduces some funny wrestling features, like neck-breaking (due to the more complicated body structure).
I even tried to make most major organs and arteries by myself, but it leads to faster death of your adventurer (more vital bodyparts -> more often death woundings), so I delayed this part in my mod.