Hello Christian ,
Here is some additional information.
1. Webpart scenario: what you need to do is modify the respective ConfigFile.xml, which is located in the /Program Files/Common Files/Microsoft Shared/web server extensions/wpresources/RadEditorSharePoint/5.x.x.0__1f131a624888eeed/Resources/ folder and add the following line:
2. WCM scenario: If you want to enable special tags in this scenario, you need to replace the original PublishingWebControls:RichHtmlField
as it is described in http://www.telerik.com/help/aspnet-ajax/using-radeditor-in-web-content-management-scenario.html
help article, and set these properties: AllowSpecialTags="true" AllowScripts="true"
3. In list scenario (list, wiki, blog ...) all special tags will be stripped, when the content is saved. So you can not insert object or any kind of special tags.
All the best,
the Telerik team
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