The Problem with the never ending route is solved by usage #4 (Version1.5), thanks.
The 2nd problem occurs sometimes with usage #1, as far as I have tested (Version 1.4!).
In Version 1.5 I have not seen this, but it doesn´t occur any time. Just a few times, when I shot vehicles with an OPFOR Helicopter, it looks like the last vehicle can´t remember the waypoints and just stand still.