Is this posted on MBrepository?
Haven´t updated it for some time and it works well on siege if we let the balance things out of discussion.The game uses a combination of the distance between entry point 0 and entry point 66 (main defender spawn and the flag spawn) to decide which entry point 1-31 it will use to spawn a defender. This is done for attackers using entry point 32. It may seem to be working but that's because the game will randomly place entry point 0 because it detected that you did not place it yourself.
What do you mean with important for siege?