I am sorry for stating the opposite of the thread's intent, but those things already exist in the toddler stage and age is relative, especially in the sims series.
I like that I can play the sequel on the same computer that I bought especially for TS3 specs; a game where the babies have a lot of these features. I would not like to have to uppgrade my computer to be able to play a game that on top of all sorts of interesting features added unnecessary asked for ones, simply being a repetition of previous iterations' interpretation.
Be careful what you ask for.
I like your werewolf idea though, but if it meant raising the specifications I do not want that either.
