Sometimes you simply want to know whether some pages are in a given category or not. For these use cases, currently you have to query prop=categories, which will give you all categories for each page. Even worse, if you have more than one category per page in average, you will probably hit the (cl)limit for the query, and have to do a (perhaps sub-)query-continue, which will again give you lots of stuff that you actually don't need.
So an option like clcategory=Category:Foo would be nice, which will return at most one category per page and so one wouldn't have to care about hitting the limit.
Version: 1.14.x
Severity: enhancement
URL: http://en.wikipedia.org/w/api.php?action=query&titles=List_of_Wii_games&gpllimit=20&generator=links&prop=categories&cllimit=20