Elona is one of the three main inspirations for my game, ad this will get more and more visible as time goes on. Although I won't go as far as introducing etherwind and playing blackjack with a luck buff received from a loaf of bread to get potions of cure corruption, the entire idea of "fantasy sim" is on the horizon.
The particular thing you are talking about though... I didn't think about such approach. I had in mind the idea of player undergoing mutations as game progresses, but having such "custom race maker" does sound VERY interesting.