[sualfred]

@nessus 

First dirty and ugly alpha with basics for movies,tvshows,episodes,artists,albums,songs,musicvideos:
https://github.com/sualfred/script.metadata.editor

RunScript(script.metadata.editor,dbid=$INFO[ListItem.DBID,type=$INFO[ListItem.DBType]

or via context menu -> 'Manage...' --> 'Metadata editor'

Video items have .nfo updating but audio items not (lack of path information from JSON)

It would be helpful if you play a little bit with all scenarios, elements and library variants.

Note:
List/array items are splitted by ";" like you would add an additional email in mail clients.