Extension:ThrottleOverrides will allow authorized users to set exemptions to throttles, for a given ip range and for a limited time. This is useful especially for editor events, where a lot new users register (account creation throttle) and edit (edit throttle for non-autoconfirmed users).
It was requested that it should be able to exempt ip ranges not only from throttles, but also from the need to bypass captchas, especially the one that comes up when a non-autoconfirmed user adds external links. Event organizers said it's frustrating for new users to follow the rules (add external proof for statements made inside an wp article) while fighting with an anti-spam measure trying to stop them from adding external links.
In order to implement this feature for ThrottleOverride, ConfirmEdit needs to offer a hook that is run inside the logic deciding whether a user needs to solve a captcha, so that ThrottleOverride can prevent an captcha from being enforced where it normally would have been. As grepping for "Hooks::run" in the ConfirmEdit repo doesn't give any results, it seems ConfirmEdit isn't offering any hooks at all.
This task is finished when such a hook has been implemented into ConfirmEdit. Implementing the feature to use that hook into ThrottleOverride is out of focus for this task and belongs to T174225.