keyword tag plugin for wordpress(repost)

I have a customer who authors a large amount of blog sites, using Qumana to write and publish articles on a Mac, and would like to have a custom wordpress plugin that does the following: 1. adds and sets tags/keywords into it that are used on every post i publish to blog. 2. adds these keywords/tags at the end of every post with a line break. 3. creates a tag/keyword cloud that shows these tags/keyword in addition to the category tags. the cloud should be able to be configured to edit the cloud title, minimum and maximum font size and color of the tags like many of the other tag cloud plugins. 4. this plugin could be designed with/without a widget but should include basic directions on the strings to include into sidebar and page template.