I suppose that depends on what your preferred collaboration workflow looks like, but there might not be much more to recommend. Shared folders are simply a “transitional” sharing space, which can be used to exchange papers between collaborators or maintain shared collections, but ultimately papers must be saved to one’s library in order to cite or edit them in any way. Group/multiple licenses don’t include any additional collaboration features.
Hope that makes some sense. I’ve mentioned in other threads that we’re currently working on a complete rewrite of our sharing structure, so we’ll be offering more collaborative features in the near future. No timeline for that yet, but we’re expecting to share a roadmap soon which should have more info about this and other features.