I have an eleven year old child that spends hours and hours playing SIMS2, and who dreams of growing up to write games like that.
I haven't learned about SIMS2 and I do not know how much flexibility SIMS2 offers the player. My sense is that the eleven y.o. would like to operate software that lets game elements to be created, situated, and interactivity defined. I guess he's looking for a virtual reality game where the operator creates virtual reality games!