At this stage we will not provide the Silverlight RadEditor within Sitefinity, but we look forward to improving our Editor to suit your scenario. What are the issues you face with the current editor?
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items