I am interested too because I only had this experience once that I noticed and an aircraft crossing my localizer signal shouldn't be as big a disturbance as an aircraft on the localizer in front of me. I was in a B757 with no one in front of me but the crossing airliner about 200 ft high crossing near the far end of my runway 9. My airline always wanted us to do autolands in visual conditions for periodic equipment checks and I always refused because without a sterile approach environment ILS signals were not protected.