Hey there. I've read TSOY and played Wushu, so let me toss in my cents.

(BTW, if you're not familiar with The Shadow of Yesterday, it's
CreativeCommons licensed! So you can read the game free online[1], or
check out the free version of the stripped-down, quasigeneric form of
the system [2]. I've read the latter myself.)

I think that TSOY has a number of interesting mechanics. Stuff that I
think is cool:

* There's XP, but most importantly is about *how* you gain XP, i.e. by
hitting on the self-identified Keys that define your character.
(Example: Key of Cowardice, get 1 XP for each time you're cowardly.)
There's also a feature to these keys called buyoff, where you get a
big one-time XP bonus (and strike the Key from your sheet) if you
choose to do something that goes against your Key. (Example:
Buyoff=10XP for standing your ground in a deadly situation.)

* You also have these important resource pools, and the only way to
refresh them is by engaging in some possibly conflict-ridden way with
the other players. (So a social challenge, a mental challenge, a
physical challenge.)

* There are things called "Secrets", but to some extent they're just a
bit like neat powerups that let you do cool things.

* Bringing Down the Pain, which is more or less like going into
bullettime. You break down your action into rounds of conflict, and
the stakes can change in the middle if you've got the advantage (from
"I graze him with my bow" to "I take down him and all his guards").

Beyond that, there's the fudgelike scale of abilities. So which of
these things do you want to port into Wushu? (Or vice versa?)

Here's what I'd do with Keys: If you feel you fulfilled your Key in a
round, you can bank 1 Held Die into that key, storing up a max of 3
Held Dice in each one (that you can unleash for a bigger bonus, or
even hand out to others as a bonus). For a buyoff, you can scratch off
the key and get a one-time boost of 5 Held Dice to use however, but
they're only usable in the context of this conflict. Finally, you can
buy new Keys for 1 Chi each.

-d

[1] http://www.anvilwerks.com/?The-Shadow-of-Yesterday
[2] http://www.anvilwerks.com/src/tsoy2/solar_system.html