You can use the Editable property and set to false. This way users will not be able to edit content:
radEditor.Enabled = false;
I am not sure what you mean with the second question. If you want to see the insert flash and media tools in the editor toolbar, then you need to add them in the editor tools file. If the flash and media are already in your content and they were added using the RadEditor WCM publishing field, then you need to use the UnEscapeSpecialTags to decode the flash and media objects:
radEditor.Content = Telerik.SharePoint.
the Telerik team