I would like to see it too. I have several pictures painted by Mort Goth when he was a child, that are really good.
Also, I would like to see a children/teen version of the LTR "Professional Slacker" one where they can use the interactions "Slack Off" "Sleep in Class" "Talk to Friends" copy their peers' and siblings' homework, even have the kids they don't like do their homework for them, and get away with it.
Jealousy/Witnessing Betrayal Sims 3 style (where the Sim will have a sixth sense on their partner cheating on them, even the babies and toddlers are effected) should effect Sims that are Children or older with the following traits: Hopeless Romantic and Family Oriented (since they seem to take commitment seriously) Sims that are evil, mean spirited, and have commitment issues, should get a joy out of another person's cheating spouse, even if it's their own parents. Since Sims with commitment issues really don't take commitment that seriously, they should remain unaffected, unless they have a full relationship with their partner, unless they are only "romantic interests" and should get even by kissing, or even just flirting with another sim.
EDIT: I also suggest child Sims should have their own set of "romantic interactions." Not like their Teen and older counter parts, more like the children on the Peanuts gang, and Winnie and Kevin on the Wonder Years. (These are primary examples to better explain my future Improvement). The child version of the romantic interactions would not always be mutual, and the mutual feelings, are just simply "childlike" boyfriend and girlfriend. If the feeling wasn't mutual, it would have no effect on the children's relationship, as children in general are too young to experience romance, rejection etc. The children romantic interactions would be "Confess love for," "Talk about future wedding/ask to marry," and even talk about their crushes to their siblings and friends at school. They wouldn't actually propose marriage, just say "I'm gonna marry you." They should also tease, make fun of, and generally be mean to their crushes, to hide their feelings, the way RL children do. I think it would be cute, if the child sim were to wash their hands and face for a good sim hour to get rid of the "cooties" after another sim kisses them on the cheek.