We love the new All Members moderation screen that allows searching. It comes much closer to what we need to identify members.
Unfortunately, the search only searches the email address, which is not available to Moderators. They can only work from the member Display names, in general.
Please ensure that this search reaches both the display name and the email address (the two values that are shown on the screen).
A workaround exists only when a member has posted an idea, because the Email author link is available on the idea itself. We'd like to see this added to comments, and in the user profile screen displayed when drilling into a member's display name.