Slightly OT, but it's to make a point...
In my MERP game I have a character that's a half-dwarf... human and dwarven parents (created with the help of magic in Saruman's breeding pits). Anyway, I let the player do it for the story, but she had to pick dwarven or human stats... essentially the fact that she as half-dwarven was only a role-play issue, and didn't have any effect on the actual game mechanic. She chose Dwarven stats. (Incidentally, as far as she knows she's sterile... essetially she's a Mul from Dark Sun)
So, in LUGTrek would you allow an mixed race character... say Human/Vulcan... to use only one set of stats or the other and not pay the "mixed heritage" cost?
“I am a soldier. I fight where I am told, and I win where I fight.”
General George S. Patton, Jr.