Make full name display optional across site

[nolageek]

For privacy's sake full first and last name of users should not be visible by default across the site. Perhaps just first name. Ideally this should be a admin configurable option:

Identity Display:
1. First name only
2. First and last name
3. username only
4. User configurable

I'm currently using this change in code to force #3:

Line 243 of bp-xprofile-templatetags.php

function bp_fetch_user_fullname( $user_id = false, $echo = true ) {
	global $bp;

	if ( !$user_id )
		$user_id = $bp['current_userid'];

	$ud = get_userdata($user_id);

	if ( $echo )
		echo $ud->user_login;
	else
		return $ud->user_login;
}

thanks to apeatling for this bit of code.
http://buddypress.org/forums/topic.php?id=50