Pushing all Users to Contacts

Hi,
What a great tool, I’ve played with the developer hooks and the examples and docs are top rate.
I have a mapping that I want to use to import all users into Salesforce, but how do I trigger off a full sync? Do I even want o start a 75,000 record sync?

I could do smaller batches. I can loop thru a list of user IDs from a bulk action or run something programmatically. Is there a hook to cause a push?

I also want to add a field for the Account ID to use for the contact.
But I don’t see the field in the object lookup. What am I missing? I see the fields I added with the field_foo example but don’t see:

add_filter( ‘object_sync_for_salesforce_wordpress_object_data’, ‘add_data’, 10, 1 );
function add_data( $wordpress_object ) {
$wordpress_object[‘account_id’] = ‘–record_id_for account–‘;
return $wordpress_object;
}