If you have a physically adept pawn 'write' into an unfinished martial script then it'll create a random book, but there is no ??? fighters book.

Any chance of adding one, Torann? I'm a fan of starting with a couple Arcane: ??? as well as adding a greater chance for the Magically Gifted trait. Be interesting to be able to do the same with the Physically Adept characters.

Well I guess what I'm saying is you can start the game with a few unfinished martial tomes and just write them with physically adept pawns to get "random" physical class books. The ??? book only adds a step for magical classes because class spell assignment is also random unless you read a full arcane tome.
Mod options has a slider that you can use to adjust how frequent (or rare) traits are, you can also disabled classes if you are going for a specific style.