Attempt #1 at bad code. At least this might give you an idea to work with.

templates.pl (use constant RSS_TEMPLATE, line ~458)

Replace:

<author><var $author></author>

With:

<author><var $author> - <var $rss_email></author>

kareha.pl

This is just stuff to add in.

# Insert above line 308

if($email='';)
{
my $rss_email ='$TITLE @ $ENV{SERVER_NAME}';
}
elsif($email!='';)
{
	my $rss_email ='< $email >';
}

# Insert after line 316

$rss_email=clean_string($rss_email);