Here is a real story, a PrimeFaces PRO user asked as to come up with an example integration of tree and datatable with drag drop. Idea is that, tree displays available column properties and dragdrop of these on column headers adds a new column on the fly with that property. First we tried p:draggable and p:droppable and realized a couple of limitations, until they are tweaked and improved in PrimeFaces 4.0, we have decided to go one level down and used native jquery draggable-droppable and integrate it with PrimeFaces Tree, DataTable, Dynamic Columns and RemoteCommand.
Here is a live example from labs, just drag a tree node and drop it on available locations in column headers to get a new column. For sure it could be done easily in JSF way with drag drop components but the point is you are not limited to PrimeFaces if there is a feature you need and that’s not available in the library. This case is one of them.