well your question got me looking, but i could not find anything that would differentiate han solo's rate of travel with mon mothma's. i took a look in the mjrchars.dat file and it's pretty easy to differentiate one character from another once you know what you're looking for. i did find one unique identifier with han solo, but adding that value to another character caused the game to crash i did try swapping the values, which seemed to have no effect on the characters rate of travel. i did manage to swap mon mothma and han solo, so that solo starts at the rebel hq and mothma starts at yavin. i also had vader to join the rebels, but that's it perhaps the variable you're looking for is in another file, or hard-coded as evaders said.