My daughter (who is 10 years old) is sick of the same things you adults are!!!! She's not allowed to play the pretend bf/gf thing or the pretend family. I just don't think its appropriate. There is a lot of peer pressure among child VMK users to do this type of thing, and she's lost virtual "friends" because she won't break my rule (good for her though!)
She also dislikes the abbreviations used. She says it makes it hard to understand what people are saying, and that a lot of players use it to get around the rules.
I'm beginning to think a VMK pay site would be a great idea! I'd pay $20 a month for her to be able to play in peace.