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No, afraid not - at least without hacking core code...

why not just make the display name be the nickname??  this is the firs time anyone has requested such a thing...  also, users are not required to have a nickname so it could get dicey and problematic.  initially its the same as the display name...

I can make a note of this and consider adding that into the display options in the future...

well, I guess your import script is already done, right?  so you would need to right another short php script and run it once...

something like this:

global $wpdb;
$users = $wpdb->get_col("SELECT ID FROM $wpdb->users");
foreach ($users as $user) {
    $nickname = get_user_meta($user, 'nickname', $single);
    $wpdb->query("UPDATE $wpdb->users SET display_name='$nickname' WHERE ID=$user");
}

though I have not actually tested it...  but it grabs all the user ids, fetchs the nickname for each user and sets the display name to the nickname for each user id...

ah, said I hadnt tested it...

change

    $nickname = get_user_meta($user, 'nickname', $single);

to

    $nickname = get_user_meta($user, 'nickname', true);