for same reason as op i am looking for this feature.
ie to be able to update the series location of an existing series from the “import from disk” interface.
series editor is no use for this task if you dont know the new paths and are relying on an import from disk scan to provide new paths after moving series between disks.
perhaps just needs a new button against “already exists” labelled “update path”, which changes the series path to this one.
thanks for considering.