pipapepippu

By default, WordPress requires users to confirm their new email address by clicking a link sent to the new email when changing it from the dashboard. 
This plugin disables this confirmation process and instantly applies the new email address.
It also disables the “email changed” notification email that is sent to the user after the change.
<h3>Features</h3>
<ul>
<li>Bypasses the email confirmation process in the user profile page.</li>
<li>Disables the post-update notification email sent by WordPress core.</li>
<li>No configuration needed. Just activate it and it works.</li>
</ul>

MailFlip – Instant Email Change

Skip the email confirmation step when changing a user's email address in the WordPress admin dashboard.

Matthew Muro

Restrict Categories is a plugin that allows you to select which categories users can view, add, and edit in the Posts edit screen.
This plugin allows you to restrict access based on the user role AND username.

Restrict Categories

Restrict the categories that users can view, add, and edit in the admin panel.

MailFlip – Instant Email Change vs Restrict Categories