Re: executable.el / sh-script.el problem?

[Richard Stallman]

    So I guess this is a feature request rather than a bug report, namely
    that it be possible to locally customise my emacs in some way so that
    insert-flag is non-nil even when I'm visiting a shell-script for the
    first time.

You can do that by redefining functions.  It is not hard.

It would be a bad idea to try to add specific customization code for
everything than any user wants to change.  There are too many of them.