Hi there,
You are not going to get all of the formats to show in the editor window as some of the CSS relies on content position. For example certain CSS may have different proprties for different div ids.
Typically, we may use different margins and padding for the class .rt-image depending on where it is.
#rt-showcase .rt-image {margin: 0 5px 5px 0; padding:0;}
#rt-footer .rt-image {margin:0; padding:8px;}
The above code would only be shown as .rt-image in an editor as it has no way of knowing where the content is. This means it would not know how to display the content with a class of .rt-image
I hope this helps you to understand that even though RocketTheme and JCE are great products, there will always be the limtations of Joomla and other extensions that need to be taken into cosideration.
Hope this helps