you refer to actions then you can tick the action that you want to have carried out if you simply click the "actions" button in the toolbar. This cannot be triggered by the Ctrl-Y, though.
In general I wonder, where you could need such a redo.
Set a certain string in a field? -> Copy&Paste or Tag-Panel
Apply a certain mask for tag-filename? -> Alt-1 (the last used mask is still there)
Renumber tracks? -> track numbering wizard, but probably specific for a certain set of files.
So: where do you need it?