Google now supports rel="next" and rel="prev" for paginated content, so I think it would be a good idea to add this to Q2A. Details here: http://googlewebmastercentral.blogspot.com/2011/09/pagination-with-relnext-and-relprev.html
It's not one of those things that will necessarily improve SEO but I think it's pretty useful, since there is a lot of pagination in Q2A.
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July 15, 2020: Q2A 1.8.5 released!