I threw Milkshape out the window cause of its horrible planning. Get Blender lol
i really dislike people like you. your post has no meaning to it at all. milkshape is just fine. you have no idea what you're talking about, and as far as i can tell, you haven't released any addons at all.
vehicles are pretty easy to make. you have to model the vehicle, and place the correct joins for the vehicle. i think hub0-4 are the wheels, or seats. can't remember.