Computer geek here as well. .NET Programmer and have a few books published through Wrox press on Commerce Server/Site Server.
I get really upset when people fly behind the flight line. The only time I did it I was trimming my plane out and controls were not where they should be but if it's a continuous thing either on purpose or because someone doesn't have the control to fly safely they do not need to be there or they need an instructor with a buddy box.
If there is a problem with the airplane it is the persons responsibility to be yelling like a madman that they do not have control just to let everyone know to take cover. Accidents happen and we need to make sure that we do everything within our power to make sure no one is injured. I had rather lose a plane any day than to to see it hit someone
For that matter, I don't like low passes over the runway when people are flying. Our club has rules against it for a reason. high speed pass over the runway with 3 or 4 people on the flight line and a battery/reciever or transmitter has problems - someone might be killed.