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When there are many categories, would be nice if user could disable/re-enable some of them to narrow the search. That should be part of the Quick Search UI, maybe via a new panel in the Options window.
I thought about it too, but I remember olangr saying that we should push hard to limit number of providers to not more then 4-5. Then you don't need any enable/disable support for such small number of providers.
But with a public API, we have no way of controlling how many providers are created.
As dsimonek says, I think it's not needed until the number of providers exceeds certain limit. And better way to go is to not let it happen :).
Then we should not make the API public.
*** This bug has been marked as a duplicate of bug 143367 ***