There is no context menu "Refactor" available to move a pagedefinition to another location. Today I was struggling to simply move a pagedefinition to another package. It seems that the "move" functionality needs to be executed from the menubar Refactor > Move.
It would make sense to add the "Refactor" menu (and its possible submenu items) to the context menu.
(Seems like this is related with bug 7502373, marked as "not a bug")