Lol. Like raising a toddler in the Sims isn't already enough work.
Don't get me wrong. It is. However, it's almost
too easy. I think those naughty interactions could even help them later in life. Parents should have different reactions based on their traits too, to the drawing all over the wall type of behavior. An artistic, or even a slob parent could care less, while a parent that can't stand art, or is a neat, perfectionist type could flip out. As far as helping the toddler later in life, maybe drawing/scribbling on the wall, could help with their painting skill, much like children using the toy oven.
Also, I think toddlers should have puzzles, and coloring books too. Give them a box of crayons in their inventory. They could play nice, or naughty with the crayons. Coloring books could be good for children or older childish Sims.
How about a scribble pad, that toddlers can draw pictures on? Mommy and Daddy could hang it up on the fridge, or frame it on the wall. Plus, it could be one of those things that could improve the painting skill later in life.
Puzzles could be another child development toy that could improve the toddler's logic skill too.