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Is wiki research (including Wikipedia research) research on computer-supported collaborative work (CSCW).
Sure. A lot of it. If it's research of the nature of wikis, then certainly. A lot of papers that study Wikipedia/wikis are published via ACM CSCW[1].
If it's research that just so happens to use Wikipedia as a dataset, then I don't know if we should even call it Wikipedia research. Some research of the content and work patterns in Wikipedia is a mixture of the two. For example, an analysis of the content in Wikipedia might be useful for identifying bias and missing information -- even if that was not original intention of the study and identifying bias and missing information is purely used to tune some content algorithm.