I have a field that the Contributor does not need to enter anything. It would be neat to be able to have the field disabled in the new-post.php page.
create an acf/load_field filter
add_filter('acf/load_field/name=your_field_name', 'disable_acf_field');
function disable_acf_field($field) {
$field['disabled'] = 1;
return $field;
}