PRO - Keyword Injection in Title-tag
Title Injection is an optional setting that allows you to add the most popular keyword on that page into the title-tag.
You can either prepend it, meaning putting it before :
KEYWORD My original title about this topic
Or you can append it:
My original title about this topic KEYWORD
This feature works with native WordPress title tag support as well as WordPress SEO by Yoast and All In One SEO pack.