For info,
I just had a play and it is possible to override the functionality as you can see in the the screengrab, I reduced the toolbar to simply a Bold and italic elements.
To do this I added an HTML element onto the page and put the following javascript into it;
What this basically does is find the element that has the class sceditor-RichTextInput and set its toolbar options.
I managed to work out what the class was by inspecting the source of the page in the dev tools of chrome. 
Based on this, you should be able to fully customize the look and functions of the RichTextPlug to suit your needs.