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1) automations that are not volume/pan based are always included with the export.
2) you can always use the "Create Track" function to include a summing track or aux and send channelstrips.
3) see number 2
4) the fastest way to bounce stems for me is to use either Track Stacks or route them manually to a Bus/Aux and use "Export Tracks" in instead of "Bounce". And you can still export the single tracks additionally in one go with the stems together. However, to use the export function conveniently there are some preparations to do like setting the volume fader to 0db and compensating the volume with a Gain plug at the end of a plugin chain on each channel strip .