Hidden registry settings documentation

How should 'hidden' registry settings be documented?
One could argue that they should not be, since they are 'hidden',
but currently 'Registry Settings' manual section documents some but
not all of them.
Keys ConfigDir and CacheTrayIcon are documented, but e.g.
ProcPath, TMergePath, MergeLogSeparator, ColumnsEveryWhere (what's
this btw?) are not.

I have just added another hidden key, AutocompleteRemovesExtensions.
Should I document it?

-- 
Alexander S. Klenin
Insight Experts Ltd.
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