You have a choice. You can not use it. You can cook at your usual temperature, with faster results. Or you can reduce the temperature and cooktime is the same, but with juicier results. At least that's how I understand it. I never use mine, as it requires too much thinking.
I have convection, rarely use it. I'll use it more on my toaster oven than on my regular oven. I have self-cleaning, but the one and only time I used it, it heated so hot it melted something in the oven and I had to have it replaced. So oven-off for me from now on.
I store baking sheets in my warming oven. I do use the warmer on the stove top though. (I have electric). I also use the warm function on my microwave. It really works.
When this one needs replacing, we'll convert to gas. We didn't when we bought this one, because at the time the boys were about 2, grabbing everything, and I was afraid they'd turn the knobs and burn themselves. Hindsight I should have done it anyway, because I never left them alone and that stage didn't last long.
Wow, never had that issue. Once there was cheese on the bottom of the oven when I self cleaned it. Created a lot of smoke for 5 minutes opened the windows and was done.
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Sometimes you're the windshield, and sometimes you're the bug.