Why not create one yourself, it is very easy to make a plug-in for the editor tool.
Take a look at the code samples, specifically there is a tutorial at http://www.episerver.com/en/EPiServer_Knowledge_Center/developerforum/2628/2646/5302/.
You could make a new tool that has a pop-up asking for the amount of words, paragraphs, or characters and then use JavaScript to paste the "Lorum Ipsum" text into the editor.