The Racial scoring system is fully automatic. I heard there was work being done on a system that would allow the player to choose from the top few races Steele qualifies for, but I don't know if it got scrapped or is just on hold.
The best I can offer is 'Custom Replacements' at the bottom of Options->Language Filters. Contrary to the appearance, you can have more than one. It replaces without regard to context, so you might end up with weird edge-cases, depending on what, exactly, you replace.