Wilbur's Wiki links to this tutorial:
which provides a good introduction to Script-fu and also addresses the
available "SF-..." widget registrations.
I believe Sven has already addressed your input parameter problem in a
> Is there somewhere some documentation about script-fu? I mean, for the
> moment, all I found was 3 very small tutorials, some scheme
> documentation, and the gimp functions in the console window.
> I really find it difficult to learn script-fu because there's not much
> documentation. For example, I need to understand what are the parameters
> to use with SF-ADJUSTMENT. I also need to understand why I can't use the
> variables I fill in when calling my script...
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