So let me get this right. There are two runways in use and they intersect. And the movements on the two runways are being controlled by two different controllers.
Well I've never worked any of these airports that would give me cause to wave anything normally kept well hidden by my Y-fronts. But if I had to do a risk assessment on the operation there's one big hazard that comes to mind almost without thinking about it.
You do do risk assessments in the US, don't you?