How can I stop the player's running animation?

[Drarack]

For a jump thrust ability.

After the player jumps, 0.3 secs later the Z velocity increases.

I'm doing this for FO3 but it's very quiet over there and I reckon it's simple when you know how. Spent hours on it.

Tried forcing a jump special idle, stop idles etc, even disabled the wsad controls and forced xy velocities for a bit, but when the controls are reanabled, frustratingly, he starts running again.

If there's a FO3 way of doing it, that's great. If on NV, I'd take that too.