When determining the damage to a Ward (say, a Strength 6 ward).  I throw a Strength 4 attack against it.  Do I gain additional shifts if I roll my attack well?  Assume I have a Discipline of 4 and I roll a flat "+0," do I add that to my attack for a total of eight ( shifts?  If so, then it seems Wards are pretty easily countered--at least by wizards.

How I understand it is that you look at the "targeting" roll to determine if it can penetrate the ward.

So if you target a strength 6 ward, and roll a 4 on your attack, the ward is unharmed and the attack bounces back at you. You then take a four shift attack with the same weapon value. (Roll well on your defense.) Oh and the best way to take down a ward is teamwork.

I would make it a grapple. You can then move them straight up after grappling them. It takes three rounds to do any damage, but the fall builds quickly...

Also the falling rules are way harsh. Even with athletics 3 and endurance 2 its got about a 50/50 chance of a take out for people who aren't special enough to take consequences.  That's a bit harsh.

need some Performance "Attacks" or "Cheats" I can use during the game

Oh for attacks you'll need a stunt of some sort. Example:
Stage Combat: You've played around with a few weapons on the stage. In fact, to get better at making fights look real you actually learned how to use a few. You may pick two melee weapons and use perform to attack with them.

But that is one of the things stunts do, give skills new trappings.

Well first I would try to get the current stunt replaced with a better one. Or at least a bit broader than just lies...

Besides taking more stunts, some things you can do:
1) Have if modify favorably existing skills. You could insult someone in the form of a song, or have it help in a social conflict via letter.
2) Create aspects! This is either done via performance or creating artwork. You could make a Lovely Painting the sale of which (a.k.a. tagging) helps with resources roles, or Sketch of the Target for helping with thaumaturgy. Or you could sing for the party making everyone Confident and Determined. Basically you act like a DnD bard. You sing and people get better at stuff.

Stunts can do cool things though!
1)From the existing ones, poet is good for modifying anything you need to right. Similar custom stunts would help whatever your favored mode of performance too.
2) Pointed performance is good too. You can direct aspects at certain people! PC one is doing it right. and PC two is out leader and similar.
3) Consider a stunt like "Irresistible Performance" that lets you sing and dance and perform as an in combat maneuvers on people. Then you can even be more like a bard!

There are rules for car chases. Their on 193-195. On a side note, you should be able to make attacks with drive, probably at weapon 4 or 5 for most cars.

I'd say they'd have to use Discipline--this kind of thing isn't supposed to be something they can punch through or dodge through, so to me it doesn't make sense to let them use their attack or athletics skills.

Yeah... but the RAW rules... I would say that's a good houserule though. I still feel like there was an oversight in the rules for the whole articles of faith.

a) The concession has to make sense and be acceptable. If an assassin wants to kill you, what concession will you offer? Surrender?

You aren't surrendering to the assassin. Its a meta-game deal. You need to suffer a lasting damage, but something like a moderate consequence does that.

b) You can only concede before the roll that takes you out. If a sniper ambushes you and shoots you in the head from a half-mile away, you won't know of the attack until after it happens. Similarly, if a wizard casts a death-spell on you from twenty miles away, you won't know it's happening.

Indeed, a one shot spell will do the trick.

c) The smart wizard won't do a 36-shift spell. He'll do ten 10-shift ones, keyed to go off together. Even if each individual spell only deals 1 consequence to you, you die because you don't have enough stress boxes and consequences to absorb all of them. Even if you can concede against one, the following spells will still kill you (sort of how an assassin double-taps an already taken-out opponent or shoots the prisoner)

A bunch of problems with that. First off they defend 4 times. You need to fight through wards 4 times, thresholds four times. Even a normal human could mount a defense of 7ish fairly easily. Or you get really unlucky and a wizard has a 10 shift ward.

Second what's this "keyed to go off"? Their are landmines, but I'm pretty sure those are mines, not long range missiles. I suppose you might be able to add some sort of delay, but that adds cost too it. You could cast four spells in a row, but that gives the target time to set up defenses. (A ten shift ward for example)

They probably have a catch of something like disease, or mordite.