D M German writes:
> I found a bug in the Babel perl code. When a table is used as input, the
> values of the table  are not escaped.

Here are two patches that fix this and implement (partly) some of your
suggestions.  I don't think Org should pollute the global Perl namespace
by default, so I've left the definition of org-babel-perl-preface to the
user for now.  The second patch has the debugging aid you've been
requesting, if you bind the symbol org-babel--debug-input to anything
the temporary input files won't be deleted after the code has run.