Im not at home atm so i cant get into super detail, ill edit the post or add new reply when i am, but its a glitch with body type 4. There is a fixed body color so the tinct option in game only colors the face and the tail, for some reason it considers the tail part of the body color. When you mess with the tinct it effect both the body and face. All this ini edit does is color the body only,which effects the tail only, which results in the colored tail. The only thing im not getting is the numbers they use to color it. They don't use a RGB hex color format, they use a single number and based on this number you get different colors. So far negatives result in the red and yellow spectrum and positives result in the green and blue spectrum. If i remember right i used 99999 for the green color i have now. :P i should make a new character and give them a skin color of green.
This edit can also lead to asymetric faces. :P my character currently has one eyebrow always lifted. You can also go past the slider limit to an extent but unfortunatly it reverts to its highest normal value on any slight character change. I should post a picture of my temporary stick figure later.