The Ka-Bar knife would be OK but all the others don't have a place but for meaningless name-dropping which IMHO unless in a videogame set in today/modern times is stupid.
I would however like to see different images for various knives, like maybe a chef's knife with a resin handle, one with a wooden handle, one with a rusty blade, one shiny, etc. There would be no difference amongst these in terms of damage, but it would help to change stuff like this up. It's just weird to see the same damn thing over and over again. I'd even like to see "Subtle variants", like one knife that does X damage, one that does X+3, one that adds to your to-hit, etc, and all have different images. Same would go for pistols and other weapons. There are hundreds of types of revolvers and magazine fed pistols in the world, and even if the differences among the types is slight, having a variety in such objects helps the player immerse himself in the gameworld. Having a stack of 13 identical pistols after killing a raider band makes you go "Hey, this is a game".
As to Martial Arts, There is a slight precedence for some in the game; the Chinese are in San Francisco and they brought there martial arts traditions with them as we saw in FO2. Given the nature of the era off of which Fallout is based, it was not common for people to learn eastern martial arts. With China as the enemy, it would be EXTREMELY unlikely for someone to learn such an art. Therefor, Eastern Martial Arts are not something that everyone should have access to, there is no tradition in Fallout's America for such.
However, the prospect of a player very skilled at "Unarmed" learning some Kung-Fu from a Shi in San Fran *Could* work with the setting.
PERK TEXT:
Kung-Fu Master
An old Shi Gentleman has taught you the ancient Chinese art of Kung-Fu, or "empty-hand fighting". You can dodge or counter many attacks, and make several special attacks of your own.
END PERK TEXT.
You would get +2 AC versus all attacks, +4 versus attacks made in melee, +30 to Unarmed skill, and some new modes for your punch and kick attacks that have special modifiers. (It was IMHO out-of-line how everyone in FO2 learned Martial-arts attacks with high enough unarmed).
However this only works providing New SFO is still a setting, as this is the only place Chinese are found and they will be the only ones who know Kung-Fu to teach it, and probably wouldn't teach it to any old bloke who wanders down the pike. So to learn it would be a reward for some service rendered by the PC, and he would already have to have a high unarmed.
There is already a LOT of discussion on swords. What was said was basically that any sword runs a strong risk of breaking the setting and would have to dodge around this to make it in. WWII souvenir katana would work but it would have to be hyper-rare because, well, WWII souvenir katanas ARE. American cavalry sabre would work, but real ones haven't been made for 100 years as of *Today*, so any would be extrememly old at the time of Fallout. Post-war swords are out because anyone who could smith a sword wouldn't bother, he'd smith something more useful.
The same applies to the Kung-Fu idea. It cannot break the setting just because it's cool to have Kung-Fu. Nobody buy munchkins likes whiz-bang shit and if you make a game that munchkins love, well, only munchkins will buy it.