Hello Tarun, Nathaniel, Randy and Patrick,
The ability to configure the spell checker is already in the development version of the control and now is the process of final testing. We can confirm that it will be included in the next official release - 2013 Q3, expected in a couple of weeks.
There is no built-in UI for now - the spell checker will be able to be configured using the ISpellChecker.Settings property which will contain two settings: SpellCheckUppercaseWords and SpellCheckWordsWithNumbers, for example (in the context of RadRichTextBox):
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