BSD:
Oomis & squeak:
Adjusting Electricity for Tzorach Ochel is (I believe) a shita of Rav Dovid Cohen Shelita, but (to the best of my understanding) is a Daas Yochid.
(Disclaimer: If memory serves) Rav Moshe indicates it is Mutar to turn a flame off (even though he does not say so outright) completely, even without a pilot. If there is a pilot, there is no reason why you can’t adjust the flame off & leave the food on, if it is a Tsorech of the Ochel, since that is removing fuel for cooking purposes, as opposed to being Mechabe (ask your own LOR). I am not aware of any heter other than Rav Moshe above to cut off the gas completely from its seperate source within the burner not for Tsorech Ochel, as opposed to the source feeding the pilot. (Oomis, you probaly hold like that “unpublished opinion” of Rav Moshe, that there is no problem in general with cutting off the gas.) If you have a source, I would love to see it.