Fritz_Brown
Super Moderator
If the player can spin a good story based on chargen or previous adventures as to why they know about this particular field, give 'em a +DM and let them try.
This. In creating a character for a game in which I am about to play, I added some skills: Swimming and Free Diving because he is from a water world, and a couple of musical instruments. The first two should be "duh"s, but the books are very vehicle-centric - they give you Small Water Craft, but nothing if you fall overboard! The musical instruments are just because it fits the concept of the character (and will be written into the backstory). Neither set of extra skills should turn him into a munchkin, but they help describe him as a character.