Here is what you can to do
1. Remove all toolbars that the user will not use - Introduction to Toolbars
2.Enable Cleaning formatting if necessary - Cleaning Word Formatting
, Cleaning Word Formatting On Page Load And On Submit
3. Enable or disable some of the built in filters - ContentFilters
. You can see a live demo at Editor / Built-in Content Filters
RadEditor tools generate XHTML and breaking the HTML is easily if you paste some non well formed content. By default the RadEditor is trying to validate and repair the invalid HTML with adding the necessary tags.
When you paste some content it is better to use PLAIN TEXT format ( like notepad ).
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