i think you have missed the point. the over-rides make it possible to keep things warm. on Sabbath evening (friday night) the system works to keep the oven on warm, overriding the thermostat so that opening the door will not trigger the oven to heat more. after the set time, 2 or 4 hours it shuts itself off. the digital display does not show the temperature but tells you if the heat is on or off. this is significant to know whether or not you can replace the food to the oven. if the oven is no longer heating you can put the food back in for the residual heat. however, if the oven is still heating you must be careful not to leave the food out too long and to intend to replace it as soon as possible. on non-sabbath holidays cooking is permitted and adding to the fire is permitted. starting and putting out the fire is not permitted. (this is based upon the difference between no manner of work vs. no servile work as recorded in various references in the Torah, (see Lev and and Ex for examples of holiday lists). yes we may use the appliance just not change its settings on Sabbath. FYI, i have no urge for a cheeseburger. Weak-willed? to the contrary, extremely strong willed. secularists and others seem to think that strong willed means making your own decisions what is right and/or ethical vs. wrong and/or immoral. going along with the crowd is the easiest thing to do. the Torah tells you to {See, I have set before you today life and good, and death and evil. I have commanded you today to love Hashem your G-d, to walk in his paths, and to keep His Commandments, Decrees, and Laws. You will then live and flourish, and Hashem your G-d will bless you... }Deut. 30:15-19 http://www.beingjewish.com/soul/freewill.html.
following the laws you scorn gives you life. choosing for yourself is your option but dont look to the Bible to support your personal choices. look to the Bible to make your personal choices. your choices are between good and bad determined by the Holy One, Blessed is He not yourself.
Geez, I must not understand.
My oven has a delay start mode (you could set for before Sabbath) and a timed delay shut-off, after so many set hours.
If you want to be in compliance with your rules, you can look at the panel lights to tell if the oven is still on, or look at your watch to see if its "safe" to open the door.