Global variable updating

Problem:
If you have a book with ten chapters and use a variable as the issue number in the footer of each page, this results in a long and manual process to update it.
It would save me a lot of time if I could update a variable across all files in a book at the same time.
Proposed solution:
At the moment, variables are only managed in individual .fm files, not in the .book file. You could have a Global Variable Update option in the book window which brings up a dialog allowing you to select any open .fm file (much like the Import Formats window). Then you can select a variable from this .fm file and type a new value for it. The variable will then be updated for all .fm files in the book (or created if no such variable exists).

There is a way to update your single variable definition across your entire book. I'm assuming you want the variable value to be the same in all or in all your selected files as well.
Requirement: The variable you are updating must be named the same in all your files.
Potential Pitfall: If you have Running h/f variables defined differently from file to file, the definitions will be overwritten to what the file you are importing from has defined.
Ok, assuming your variable "issue number" is named the same in all your chapters, make a copy of one of your chapters by saving it out as "importvar.fm" (or whatever).
Now edit the definition of that user variable to what it needs to be. Do not close the variable palette.
In the list of user variables, delete all other user variables, but leave "Issue Number" as the only user defined variable in the palette.
Close the variable palette and save the file.
Select the files in your book that you want to import to. File>Import>Formats (Alt FIO) and select ONLY "Variable Definitions". Select "Import".
Done. In addition to your request for an update to the program, I would like the ability to deselect the system variables from a "Variable Definitions" Import.

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