Started to think about it - even after replacing my MAF last week (to resolve sluggish hesitation), the long crank when hot problem remained. From everything I read, it appeared this long crank could be caused by a blown fuel pressure regulator. Yesterday I pulled the vacuum line off the regulator, and fuel started dripping steadily out of it, so it is definitely shot. I am leaving work early today to get a regulator and reinstall it. I am hoping the ETS was somehow just triggered by the poor running condition, but who knows? Either way, the regulator needs to be installed; if it fixes the problem, great. If not, at least I have a baseline from which to start. I'll report back.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280