In order to customize the headers of the docked in the DocumentHost Panes and achieve a double click edit mode you will need to create a custom control that has both editable and non editable modes. After that add that control to the RadPaneStyle's DocumentHostTemplate and in that template replace the TabItemContentPresenter with x:Name="HeaderElement"
with the custom control. We created and attached a sample project for you that shows a possible approach in achieving the desired behavior, hope this is helpful.
In order to achieve floating of Panes all you need to do is call the MakeFloatingOnly()
method of the RadPane you want to float from the code behind.
You can read this
help article that described how to customize the menu of the Panes.
I am not sure what you mean by tab switcher as the attached screenshot is very small in side and it is hard to observe it.
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