[Unclenick]

That's probably less of a concern than you might expect. It would happen to anything you put in the oven, so for the temperature control to be meaningful the net effect of all heat sources have to be taken into account. Any radiant heat source you have will also irradiate the sides of the oven, heating them, and they, in turn will affect the temperature of the air. Since, unlike a broiler, the heater cycles on and off, the air will take up heat from radiantly heated objects by convection during the off portion of the oven cycle. The average temperatures of the objects will go up some, but they won't run away.