There doesn't appear to be any way to do this short of modifying the source code. In particular, the TableEditorControl in DotSpatial.Symbology.Forms could be trivially modified to add a new ToolStripMenuItem. What is not trivial is exporting the contents into an Excel sheet. You would have to rely on third-party code to do this and write your own DataManager to save the contents. http://epplus.codeplex.com/ will get you a library for manipulating Excel files.
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