an item in the timeline (whether greyed or not), should provide a context menu item to "select same", which would populate the fitler with the same entry to find all like instances

Right now, I select "copy", then paste that into the filter, but this usually doesn't work without editing that result (beyond the time removal), since it often contains characters that are interpreted, like '-', ':', etc

So Filter same command which creates something like
"some title"

Will be added.