Hi,
Yes you can.In the export orders file, find the select query that selects the fields that should be exported. Just add the fields you want within the query (as long as they are in the same table. If this is not the case, you will have to join two tables). Then where you see "Queries 1" ... to 9 you can play with this to add the information you need.
Regarding your second question, I didn't really look into the file but you could add something like this that will display the number of exported orders on your page :
$reccount = (integer) mysql_query("Select COUNT(orders_id, date_purchased, customers_name, cc_owner, customers_company, customers_email_address, billing_street_address, billing_city, billing_state, billing_postcode, billing_country, customers_telephone, delivery_name, delivery_company, delivery_street_address, delivery_city, delivery_state, delivery_postcode, delivery_country, cc_type, cc_number, cc_expires) from orders");
echo 'Number of exported records : $reccount' ;
David