Shticky Guy, we have had this discussion before (and I was castigated for mentioning it). While your point is true of ovens made and sold in recent years,that is not true of the VERY old (40-50 years ago) ovens which had the pilot light on contin-uously, and where the flame moved from one part of the stove (the pilot) to the burner. I will not go into the entire science or halachos again, but it was permissible then to adjust the burners, based on mavir, and not m’avrer. The ovens that were made subsequently, had electric ignition for the pilots, and therefore cannot be used in this manner, as they create a new spark each time the oven/burner is turned on. In the case of the older ovens, the spark is not created, because the flame is already burning. It is mearely moving along the trajectory of the gas line. When the burner is shut off, the flame retreats to its original “home” in the pilot, which is Still burning the entire time.
Charlie, could you PLEASE tell me where I could find such an oven made and sold today? My stove top and wall oven are VERY old and decrepit, but I nurse them along, for exactly the reason you mentioned.