Knife basics is so useful, being armed with all your knives on your person. So if you have a collection of different knives you have: Bleed, hurl, guard, lure, hook, keen, finesse, grip, excruciating, trip, and AP there to use when you need it. So much fun!
The problem going with small weps more attacks you have to, IMO, also implement a larger weps get a hit first when closing type of rule. No way your getting a dagger into me when I am waiting with a long sword! See Hackmaster 5 for that, although I guess there are some rules for that in some D&D supplement too
FC has such a great array of options that can be made into combat beasts. The guys here will give you great advise on how to make whatever concept you want. I don't play FC (cos I play with my kids and it is too complex) so I am not up enough with the system. But sitting down with the FC books and making a character is a lot of fun and full of crunchy options.