i would find it nice to see if martial arts is able to combine with weapons. a friend of mine is learning martial arts and he for instance is learning how to use staves, shurikens and small swords.
I was thinking then that each martial-way would give advantages and devantages to weapons. like a art that gives advantage on close-range combat(short swords/fists) one for medium (staves, spears, halbards) and one for distance (shurikens, crossbows, javelins)
this is just an idea, but i have seen it in other games. tough none of them was online-playable.