The spoiler indicator light is normal. That was the first thing I asked about when I bought my S a few years ago! It should, or at least mine does, come on for the first few minutes of driving. I wouldn't worry about it and I'm sure someone has a lot better explanation as to the "why" part..
The smoke could be normal due to the characteristics of the flat 6 but you say it lasts 30 seconds??? That would make me lean towards the possibility of an AOS failure. Do a search on this forum and there will lots of info. Not saying it is that, but it could be.
I'm not sure on the door lock problem, but once again, I 'm sure there's lots of info on this wonderful forum. I just haven't had that particular problem yet.
sean
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