UnIMpossible has a hint and titletext at the start if you are in Cadet mode. Given that the start is so hard anyway, it's virtually terminal, or likely to be if you're the kind of person who likes to play in Cadet. Also you get no waypoints, which is a big reason for playing Cadet. I did consider making the mission end, but thought what's the point, if somebody wants to play it in Cadet why should I stop them. The mission designer is trying to create fun after all, not prevent people from having fun.
Glad to hear about the blackop motorbikes. The guys at the back always seemed to be walking when I found them.
As for the test, your mistake is to run it when you are at work or overnight. You have to run it while you are there, or at least popping in every few minutes. Use ECP's specator script so you can see what's going on.