Emacs: repeat last tag change?

["inwit" <inwit@sindominio.net>]

Hi,

While using notmuch in emacs (which I love, thank you so much!!) I was
wondering if there's a way to repeat the last tagging operation for a
different email. My usecase is that, in tree-mode, sometimes I need to
tag several unrelated emails, and it would come very handy if, after the
first tag change, I could use a shortcut (I'd choose '.', as in
vim/evil) which would apply the same change to other emails. 

Does this make sense? I know I could perform a search for all the emails
that I need to tag and tag them all at the same time, but the criteria
to select them is usually not obvious.

Thanks in advance.

Regards,