I'm three hours or so into my real work, after being side-tracked isolating and reporting Glassfish and Mojarra bugs. I just found another one in Mojarra, albeit a trivial one.
(Edit) I'd written a little rant about the problem I was trying to solve, in the assumption that I'd hit another limitation/bug in JSF2. Well, this time I was just plain wrong; I'd used an incorrect test to draw an invalid conclusion and from there ran down the path - from my previous experience, admittedly - of assuming that this, too, was a tools issue.
The correct answer is here: To permit null/empty/none selection in a h:selectOneMenu driven by a f:selectItems , just add a f:selectItem with no value before the f:selectItems.
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