I just saw this post!
Sounds like a sweet idea, But you need to keep balance in mind when you make it.
You might want to take a look at a d20 system called B.E.S.M. (Big eyes small mouth) Which is an anime version of D&D, This system used a point buy leveling system with each stat point at 1/2 point per cost. The system is a little hard to balance, but once you figure it out its kinda cool. It comes with its own custom classes and advice how to create your own. This system tears the realism out of D&D however it makes for very fun experiences.
And honestly if someone shanked me, and took something while they did it, it would be very hard not to notice. so perhaps DC (Dmg-5)
Even then a crippling strike that would deal 25 damage with a save DC of 20 would still be easily do-able by a racial modifier of 8 that most monsters get.
Edit: About the Job point system. If you merely gave the Classes the ability as they leveled the same as D&D does, that should help balance the job idea of it. EX: (LV:2 Evasion -> Hiding)
VaIor: Paladin 9x/6x, Valor: High Priest 99/70, Valor's Chemist: Creator 9x/6x, Weaver: Clown 99/70, Blank: Stalker 9x/6x, Spire: Sniper 9x/6x
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