Installed without a glitch in Joomla 1.5.15. I did need to turn-on contactlink in the plugin manager, I guess that is SOP. Works well when then contact is embedded in the body of the article.
Very nice idea, but no, it is not possible to pick up the "Written by" authors name. And yes, manually enabling a plugin after installation is a standard operation procedure. You likely want to configure your plugin first, before it starts changing your webpages.