Auto tag by author Wordpress plugin

The site is [[login to view URL]][1] The site is hosted on Blue host, uses Weaver 2.2 Theme and Wordpress in Hebrew 3.2.1. I want a plugin to perform the following functionality: Auto tag by author - all the posts a specific author writes should be able to automatically be tagged with a certain predefined tag. I want to be able to have a menu in the admin panel to define what is the automatic tag to be allocated to each author. This should not be able to be overridden by the author if I choose so. I want to be able to define in the menu that certain authors will be able to choose there own tags. The final product will be a plugin that will be sent to me as a zip file. All the work will be done off my site. The solution should stand future upgrades of wordpess and the theme. As the first stage, the freelancer will submit a draft layout for the administration panel on a powerpoint file. The freelancer should: Have experience in PHP and Wordpress.