The Power CMS is really for editing content of pages. This data set that you are talking about should have it's own table so that it can be updated and edited as intended.
You can have a set of pages created with DataAssist to manipulate the data in this table in the back end of your site. If you would like to add the rich text editing ability to any part of these pages you can make use of iRite or the new HTML Editor to add in this type of editor.