Best place would be in the little brass tube by the right ear, that's the one-way valve that'll feed down into the regulator... Not sure how you'd light it though.
Since it is in the O2 feed, I am going to go out on a limb here and say "VERY CAREFULLY"
Nah, we only dive compressed air, so nothing combustible goes through there. Diving with enriched O2 can be really dangerous, especially the deeper you go. At a certain point the O2 concentration can actually become toxic, resulting in convulsions and unconsciousness. Both bad things to have happen underwater.
Those who dive really deep, we're talking hundreds of feet deep, use a mix where Helium or other inert gases, replace the Nitrogen because at high concentrations (which increase as pressure/depth increase) can cause Nitrogen Narcosis, which makes you feel basically drunk. You can lose feeling in your limbs and the ability to think clearly, also not good to have happen underwater.
These helmets can go that deep and use mixed gas, but usually they require a little modification (gas reclaim usually).
If you want to go real deep, like 2,000' down, you need one of these bad boys, recently adopted and certified for use by the US Navy. They've got 4 of em.
It's basically an underwater space suit. It keeps you pressurized at surface pressures so you don't have to deal with all the nasty stuff that happens from breathing at ultra high pressures.
Edited to add: ^ too many "pressures" in the above sentence!
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