Recent discussions, like have occurred in mailing lists (Wikimedia-l June 2015), and shown in [[T103122]] have a requirement that there can be occasions where an event is being organised that there is the need to confirm multiple accounts to avoid captcha functionality.
Stewards have an availability with the Special:Multilock page to paste multiple accounts (one per line), and lock them in a two step (test-exist and lock) process. This format could be usable for Special:Multiconfirm that would allow a list of accounts to be confirmed with the one reason field rather than having to undertake many sequential individual confirms.
If necessary such a special page could be accessible to local admins to a local wiki by default, and there can be a broader discussion whether/how/form that it exists on a broader scale, by other means, eg. create a local group with the right to the form.