Pressure points on the thigh?
In Kempo we don't particularly try to hold pressure on a nerve but strike it. So I don't know many pressure points but on the thigh area of the leg are two really good strike points on the sciotic nerve.
The first is on the side, along an imaginary line where the gluts and quad's meet. The second is on the side of the leg about 3 inches above the knee, along the imaginary line between the quad's and femoral biceps.
Those two points need a sudden jolt from a strike to be effective, but the leg will go limp and be useless for a few minutes. I know because I didn't think that it could and my instructor demonstrated on me.
what you do,
when it counts.