This is something we’d like to have for our journal, too. We have two “issues” a year and publish as soon as an article is finished. But the articles should better be sorted in chronologically order, and there is a need for “collections”, too, as this other thread is correctly suggesting:
I would love to see move OJS a bit more in the megajournal direction. PLOS, PeerJ & Co are very attractive to authors and should have a bit of a role-model character.