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Heating may cause temper problems with the metal, so best to go with chop saw, etc.. You could wrap it next to the cut with a strip of cloth, soaked in cutting fluid or oil, which would simultaneously lubricate the cut and keep the metal cool.
Cut springs is an ongoing controversy on the BMW forums, with purists claiming the only solution is buying aftermarket springs, yet others who've cut a coil or two off the stock springs mostly (but not all) saying the ride and handling was as good or better than pre-cut. Consensus view is never to cut with a torch, due to temper issues weakening the metal.
I'll probably cut my springs as noted above, see how it works, and then go to aftermarket lowering springs if needed.
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