Could there be legal reasons for this?
Given that halflings don't look that much different than human children, I could see the risk of the game getting fully banned in some countries.
My halfling was every bit a grown woman. No mistaking her for a child if you tried. She had T&A for days.
If the shorty options were problematic legally, custom shorty Tavs wouldn't be allowed to have nekkid sexy-time scenes for the same reason.