[dvd3500]

So Henk,  you are saying that once car "A" makes a lane change, the flipper stays in that position until another car "B" comes along? Then when car B crosses the sensor it triggers the LC back to the straight ahead position, unless that driver also hits their LC button and makes the same lane change?

That is exactly what happens...

If you  want to test it (using ARC PRO) you can set up a race with regular car and a pace car then cover the LED with black tape. Start the race and since the sensor doesn't get a signal from the pace car the flipper won't change and the pace car will follow the race car.
Take the tape off and you can see that the flipper always goes back to straight.

I do this sometimes to make racing a little more interesting. The only downside is the pace car will not count laps if the LED is covered up.