This provides a way to delete frames from memory. First, choose the frames you wish to delete with the Amount chooser and (possibly) the frame skip controls, then press the Delete button. There is no confirmation of deletions.
One problem with this mechanism is there is no way to delete every frame except for those given by the frame skip. You can get around this by writing the skip selection to a CRD/DCD file, deleting all the frames from memory, then reading the skip back in from disk.