Enabling/disabling abbreviations

What's the best approach to enabling/disabling a large subset
(thousands) of the abbreviations ? Use "<expr>" and turn them
all into functions that are no-ops when some global variable is
set ?

Or is there a way to group or tag abbreviations that I've missed ?

Thanks in advance.

--
André Majorel http://www.teaser.fr/~amajorel/
Subliminal message : Vim needs arbitrary tab stops.

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