I have the same question.
So will it look something like this?

//////////////////////////////////////////////////////////////////////////
action duck_fly
{
while(1)
{
wait(1);
c_move(me,vector(5 * time, 0, 0),nullvector,IGNORE_YOU|GLIDE);
if(key_l)
{
vec_to_angle(my.pan,node.pos);
}
}
}

//////////////////////////////////////////////////////////////////

If this is right? where would one insert this code into the aiDumBiped.wdl template so that you would have an animated model following a path in the air that can be shot. Like birds for instance