@MixMonkey, you were exactly right when you were surprised a few pages back how free-form the Shift (Control, etc.) Zone definitions were.
That way works great until you start layering other Zones on top, then you have to be careful that pressing Shift (which Activates the Home Shift Zone among others) doesn't clobber a layered definition with the Shifted Home behaviour.
Clear as mud right ?
Anyway, looks like I was overzealous in the use of Zones, let's go back to the old notation:
Select TrackUniqueSelect
Shift+Select TrackRangeSelect
Control+Select TrackSelect
etc.
That solves one part of the layering issues with which I'm currently wrestling.