> namely an implementation of the stuff that makes it possible to go fullscreen 
> and back.

I remade .fvwmrc and set this to do what you wanted:

Key F9 A M Maximize 100 100

There is a lot options to change and make fvwm just perfect.
This takes the shell as an input and fullscreens it and, with
repeated press (alt-F9), scales back.
Best regards

                                    Zoran

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