Hi Frederick,

re:
> I was thinking that it might be able to check/uncheck the "Both Sides" box (and
> similar things) in the dialog by using/not using a key
>
> Cannot be done?

A command can register a shortcut key and then do something when that key is pressed. See attached example where typing the B key works the same as clicking on "Both sides".

But it works like other shortcut keys under Options > Shortcut keys, you can't do something when the key is pressed and something different when the key is released.

- Michael