This is a good idea, but kids can already learn some of these skills (so maybe I'm misunderstanding). But the way it works in-game now is that kids must first learn the child skill and then once they complete it - the adult skill shows up. So for piano after they max creativity, once they play the piano again the adult piano skill will show up.
So is this mod like a cheat to get children to learn the skills quicker? I kind of like the difficulty the game has built into it already so that only true prodigies can master both kid and adult skills while a child.