I think I have an idea for implementing an editor here. First, I could use a Prompt with List action to let the user pick which line to edit, then I could use a Prompt for User Input to allow the user to edit the line. In fact, the Prompt for User Input is particularly good because I can use it to display the two independent fields of the line in the file (Display Name,Full Address). The only complexity is that I'd need a special pop-up window to ask the user whether they wanted to Add, Edit or Delete an item from the file.
I think I like this idea very much, because it illustrates how to solve a problem with KM (the lack of a variable editor.)
EDIT -- It seems to be all working, including the editing functions. But before I upload it, I'm going to test it for maybe a day. Here are a few screenshots so you can see what it looks like. Your feedback, even your criticism, is welcome.
Here is the window for adding an entry:
Here are the windows for editing an entry:
Here's the window for deleting an entry:
Here's the window that warns you when you attempt to reset the list to some defaults: