However, what I really want to do is to be able to use the "Default Author" field in the RSS feed set-up to set the "created_by" field in the content item.

Is there a way to do that.

I tried this solution but is not working

$query = "INSERT INTO #__content (`title`, `title_alias`, `introtext`, `fulltext`, `state`, `sectionid`, `mask`, `catid`, `created`, `created_by`, `created_by_alias`, `checked_out`, `publish_up`, `publish_down`, `attribs`, `version`, `ordering`, `metakey`, `access` )";
$query .= " VALUES (
'$title',
'$title',
'$intro',
'$fullTxt',
'$publishState',
'$sectionid',
'0',
'$catid',
'$publishDate',
'62', <------- '$created_by', here is set on 62 the default id of Administrator

but if I use $created_by, feedgator insert 0 in table content
why?
I am sure that the solution is simple but I can not find it
Why not work "created_by" inserting instead of the number 62? "Created_by" is in "_feedgator" table and is called to be included in the table _content