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mickey.z if I remember right...

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Confirmed by the manual :

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mickey
Movement of the mouse in pixels (mickey.x, mickey.y) and the mouse wheel in 120 units per notch (mickey.z) within the last frame.
Type:
vector, read-only
Example:
action move_me_by_mouse()
{
mouse_mode = 0;
while (1)
{
my.pan += mickey.x*time;
my.tilt += mickey.y*time;
ent_move(vector(mickey.z*0.1*time,0,0),nullvector);
wait(1);
}
}

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