If you have a clip in one sequence, you have all the information you'd need to duplicate that clip, in another sequence.
Also, what drag and drop are you hoping for?
Panels already support dragging _from_, but doing so is a terrible idea; PPro displays at least three different behaviors depending on where the drag ends, and the panel has no control over the behavior, nor any way of finding out what happened.
We strongly recommend avoiding drag-n-drop from a panel, and using a "check boxes next to assets to select them, then click an 'Import' button" workflow, to bring in assets with maximum control.