mgordon,
You don't have to inherit CuteEditor.Include.insert_link class. You can create your own file based on the insert_link.aspx file.
"but then the dialog title, labels and buttons have no text value because the reference to the CuteEditor.Include.insert_link class has been broken."
The reason we need that codebehind is: we need to switch to different language settings based on server or clients' editor's culture setting. You can just type your title for your dialog, labels and buttons for your own purpose.
e.g. instead using:
<title><%= Str_linktitle %></title>
Use:
<title>You title </title>
Keep me post
<%= Str_linktitle %>
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