Loving the new filter/tag system in Live 12, and being able to create labels in the 'Library' section at the left of the browser from custom tags is great.
Once that's done by the user, feels like it'd make intuitive sense to be able to drag items from the browser onto those lables, to add the that collection/tag.
That can currently be done by clicking the edit button at top/right of the browser, finding the approprite tag, and clicking the selection box, but that's a bit cumbersome - also having the easier option to drag and drop items onto the label to add them would make a difference.