Hey there! There's a download link named FotS guide on the main page that should give you a .txt document telling you everything you need to know - including the scores you need to actually achieve right at the bottom, for those who don't want any guesswork whatsoever ;) I know stat raising isn't for everyone, it's mostly there to include -some- manner of gameplay.
Can I ask what you mean by noticing a file - do you mean in the game directory? To answer your question though, it is indeed possible to get favours from all three knights; all you have to do is match all their requirements and you'll have a scene receiving multiple favours, and the option to choose the one of your fancy.
Thanks very much for playing and the lovely compliments!