Currently, autosomal DNA test information is propagated, via the "It is likely that these autosomal DNA test-takers will share DNA with..." note as far back as the tester's 6G grandparents and as far laterally the tester's 3rd cousins.
I believe that the algorithm that decides where to show autosomal DNA test information follows essentially the same logic as the algorithm used by Connection Finder. That is, it counts relationship steps along blood connections, and it apparently goes back 8 steps for ancestors and 7 steps for cousins. However, considering the theoretical statistics of DNA sharing, if the algorithm goes back to 6G grandparents, it should go out at least as far as 3C-1R cousins and probably also 4th cousins.
Adding additional degrees of sharing for cousins would make WikiTree's DNA tools more useful for members. I've found some hitherto-unknown 3C-!R and 4th cousins as a result of exploring some good DNA matches, but (for those who are also WikiTree members) WikiTree doesn't show their DNA test information on my profile, nor mine on theirs.
I don't think that autosomal DNA test data should be propagated any farther back than 6G grandparents, where it is now, so I think the improvement I'm asking for might be tricky to implement.