How to create a waypoints trajectory without inertia ?

Hello,

When I create a waypoint trajectory of straith line I got inertia so the way is not really staight. When I use the 'Course' options I can have trajkectory which are staritgh line but ther is a bug because the angular veolicty are wrong : Even if the trajectory is straigh line, the angular veolity continue to change during the straight line displacement ! I think it is a bug in the code no ?

Thanks !