When I commit in Magit, I have the option to "Sign using GPG". But when I revert a commit in Magit, I don't see this option. Is it hidden? If so, how do I activate signing in that context? Otherwise, does the feature not exist?
I've just added
--gpg-sign to the revert popup.
Since it sounds like you are signing all commits anyway, you might also just set the Git variable
And you can always add your own actions and arguments to a popup. In this case this would have worked:
(magit-define-popup-option 'magit-revert-popup ?S "Sign using gpg" "--gpg-sign=" 'magit-read-gpg-secret-key)
For more information about that, see Customizing existing popups