In our journal we use DSpace as a repository for articles (is mandatory by our country laws having an open repository for the articles). Now we use the remote galley option in OJS por link the pdf in OJS with the one in DSpace and that’s the only connection between the two platforms.
I think it would be great to increase the connection possibilities between both platforms in another ways. e.g. embed statistics from DSpace into OJS, …
I don’t know if this case happens in other journals.