Items in Multiple Collections?

I thought I would re-raise the recurring question about whether or not Omeka Classic has plans to accommodate objects in multiple collections. The ability to have an Item in Multiple Item sets is the primary reason that I switched to Omeka S, but the extra complexity of Omeka S is daunting. If there was a way to have Classic Items in more than one collection, it would be much more suitable for my project and my skill level.