I guess it was too much to hire a VA to do non-human child voices, or to get the current child VA's to switch it up for a Elven, Khajit, or Argonian inflection.
I was hoping that I could suggest a simple (but high quality) pitch shifting could alleviate the problem... so, same VA's, but some effect in post. I have very good software, and still, it does sound quite artificial (IMO). Example:
Normal:
http://home.comcast.net/~bcoutu/femkhajiit1.mp3
Shifted to child range:
http://home.comcast.net/~bcoutu/femkhajiit2.mp3
Oh well. Maybe someday. Maybe that will be another small DLC they throw out in the future - like a 'beast orphanage' in Solitude or something. But I'd just be happy with a khajiit female to marry!