The painfully hidden feature of Page/SubPage is the three clicks to
"Select Page and Subpages". The fact that this is possible, in my
mind, gives OneNote's subpages a mild reprieve. (My suggestion was
control+left click of the Page of a Page/Subpage group = "Select
entire Page/Subpage Group".
But three clicks ? Howza guy to know. This is my first three click
feature in any program.
If OneNote's subpages had a collapsable tree view widget ... now
THAT's a subpage !