When using an analog throttle, the usual way of mapping the axis is mapping both positive and negative axis. If I do this, I can use the throttle once I'm in the air.
However, on the ground, doing full throttle will not do anything. The plane won't start rolling. When pressing the appropriate thrust key on the keyboard, the plane starts rolling. Once it has a certain speed (around 15 km/h) the analog throttle suddenly works. Stopping the plane (without switching off the engine) and then using full analog throttle again will again not make the plane roll.
In essence, the analog throttle only starts working if the plane is going above 15 km/h