RadEditor does not offer the requested features out-of-the box, but you can implement them using custom dialogs.
For your convenience I have attached an example demonstrating how to edit, add or remove select element items from a custom dialog.
Kind regards,
Rumen
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Explore the
Telerik Public Issue Tracking
system and vote to affect the priority of the items