So far, the only non-InSim option I know about for "Toddler Skilling" is Simskys Smart Toddler Painting. It lets your toddler learn Walking, Talking or Potty Training instantly, depending on what icon you click in the painting.
You can find it at MTS2 here:
http://www.modthesims2.com/showthread.php?t=231431
Alternatively, here is the link to Simsky's home site:
http://simsky.parsimonious.org/
**EDITED TO ADD**
Simlogical has a cool mod that makes Toddlers in their cribs after 8 pm sleep clear through the night (until 6 am) unless Hunger is critically low! You can get it here:
http://www.simlogical.com/sl/Sims2Pa..._Childcare.htm