Hair Colors For The Sims

I think that would be awesome, especially for children.  I do not understand why children can't  have pink  hair like their parents in genetics? 

I think the hair colors should be improved similar to how skin tones are, like a chart of tones ranging from lightest to darkest

Absolutely! More colors added for hair or a hair color slider would be so awesome. Imagine if there was a slider for hair length, too?