Rectus Inc.

A plugin for convenient tag management. 
When posting, any tags that exist on the page will be automatically registered. 
You can also register or delete tags for all pages at once.

Rectus Auto Tagging

If a tag exists in a page at the time of submission, it is automatically registered. Tags can also be registered or deleted for all pages at once.

ramon fincken

Auto sets the more tag to post title if no custom text has been set. 
 Auto text is customizable using mp_auto_more_more_link_readmore filter in the Premium version: 
<a href="https://webshop.mijnpress.nl/shop/wordpress-auto-more-tag-text" rel="nofollow ugc">Buy premium</a>
Coding by: <a href="https://www.mijnpress.nl" rel="nofollow ugc">MijnPress.nl</a> <a href="https://twitter.com/#!/ramonfincken" rel="nofollow ugc">Twitter profile</a> <a href="https://profiles.wordpress.org/ramon-fincken/" rel="nofollow ugc">More plugins</a>

MP Auto more tag

Auto sets the more tag to post title if no custom text has been set.

Rectus Auto Tagging vs MP Auto more tag