fspecialskillbonus confuses me. The other 3 skill bonuses seem obvious, but what skills are "special"?

I'm stumped on that, too.. I looked up the "other three" that you mentioned, and I see that they seem to govern the skill increase of major, minor, and misc skills. Not sure what a special skill is then! Maybe it's an unused variable? I don't know what a special skill could be.

You chose a specialty in character creation. Either combat, magic, or stealth.

Any skills within that specialty will increase faster according to that setting. It works in conjunction with the other related settings, such as fMajorSkillBonus.

The mystery at last solved. Thanks a bunch!