> it's possible that the #! line processing may rely on \n line endings
It does.  Python on POSIX can import modules with CLRF, but the shebang machinery can’t parse the first line to get the interpreter to run.  Does anyone object about changing that?

Re: generating scripts, I’m moving from -0.5 to +0.  I think this requires a bit of summing up previous discussions (bug reports, emails, pros and cons here and there) so I won’t get to it for weeks or months, but someone else is free to do it.  I suggest opening a new feature request and linking to it from here.