Hacked /system/expressionengine/modules/member/mod.member_settings.php allows Socialee users to change their screen names. Changes are noted by comments.

gistfile1.php

<?php

// ------ Line 1365 ---------


	/**
	 * Username/Password Update
	 */
	function update_userpass()
	{
		$this->EE->load->library('auth');
    
    
    // BEGIN HACK to get Socialee working!
    $socialee_group_id = $this->EE->db->query("SELECT preference_value FROM exp_socialee_preferences WHERE preference_name = 'group_id' LIMIT 1");
    $socialee_group_id = $socialee_group_id->result_array();
    $socialee_group_id = $socialee_group_id[0]['preference_value'];
    $uses_socialee = ($socialee_group_id == $this->EE->session->userdata('group_id'));
    
    if($uses_socialee) $_POST['current_password'] = " ";
    // END HACK

	  	// Safety. Prevents accessing this function unless
	  	// the request came from the form submission
  
		if ( ! $this->EE->input->post('current_password'))
		{
			return $this->EE->output->show_user_error('general', array($this->EE->lang->line('current_password_required')));
		}
  

		$query = $this->EE->db->select('username, screen_name, password')
							  ->get_where('members', array(
							  	'member_id'	=> (int) $this->EE->session->userdata('member_id')							
							  ));

		if ( ! $query->num_rows())
		{
			return FALSE;
		}

		if ($this->EE->config->item('allow_username_change') != 'y')
		{
			$_POST['username'] = $query->row('username');
		}

		// If the screen name field is empty, we'll assign it
		// from the username field.

		if ($_POST['screen_name'] == '')
		{
			$_POST['screen_name'] = $_POST['username'];			
		}

		if ( ! isset($_POST['username']))
		{
			$_POST['username'] = '';			
		}

		// Validate submitted data
		if ( ! class_exists('EE_Validate'))
		{
			require APPPATH.'libraries/Validate.php';
		}

		$VAL = new EE_Validate(
								array(
										'member_id'			=> $this->EE->session->userdata('member_id'),
										'val_type'			=> 'update', // new or update
										'fetch_lang' 		=> TRUE,
										//'require_cpw' 		=> TRUE,          // original
										'require_cpw' 		=> !$uses_socialee, // HACK for Socialee
									 	'enable_log'		=> FALSE,
										'username'			=> $_POST['username'],
										'cur_username'		=> $query->row('username') ,
										'screen_name'		=> $_POST['screen_name'],
										'cur_screen_name'	=> $query->row('screen_name') ,
										'password'			=> $_POST['password'],
									 	'password_confirm'	=> $_POST['password_confirm'],
									 	'cur_password'		=> $_POST['current_password']
									 )
							);

		$VAL->validate_screen_name();

		if ($this->EE->config->item('allow_username_change') == 'y')
		{
			$VAL->validate_username();
		}

		if ($_POST['password'] != '')
		{
			$VAL->validate_password();
		}

		// Display validation errors if there are any
		if (count($VAL->errors) > 0)
		{
			return $this->EE->output->show_user_error('submission', $VAL->errors);
		}

		// Finally, and most important of all, was their
		// current password submitted correctly?
    if (!$uses_socialee)  // HACK for Socialee
		if (! $this->EE->auth->authenticate_id(
			(int) $this->EE->session->userdata('member_id'),
			$this->EE->input->post('current_password')))
		{
			return $this->EE->output->show_user_error('general', array($this->EE->lang->line('current_password_incorrect')));
		}

		/** -------------------------------------
		/**  Update "last post" forum info if needed
		/** -------------------------------------*/

		if ($query->row('screen_name')  != $_POST['screen_name'] AND $this->EE->config->item('forum_is_installed') == "y" )
		{
			$this->EE->db->query("UPDATE exp_forums SET forum_last_post_author = '".$this->EE->db->escape_str($_POST['screen_name'])."' WHERE forum_last_post_author_id = '".$this->EE->session->userdata('member_id')."'");
			$this->EE->db->query("UPDATE exp_forum_moderators SET mod_member_name = '".$this->EE->db->escape_str($_POST['screen_name'])."' WHERE mod_member_id = '".$this->EE->session->userdata('member_id')."'");
		}

		/** -------------------------------------
		/**  Assign the query data
		/** -------------------------------------*/
		$data['screen_name'] = $_POST['screen_name'];

		if ($this->EE->config->item('allow_username_change') == 'y')
		{
			$data['username'] = $_POST['username'];
		}

		// Was a password submitted?

		$pw_change = '';

		if ($_POST['password'] != '')
		{
			$this->EE->auth->update_password($this->EE->session->userdata('member_id'),
											 $this->EE->input->post('password'));

			$pw_change = $this->_var_swap($this->_load_element('password_change_warning'),
											array('lang:password_change_warning' => $this->EE->lang->line('password_change_warning'))
										);
		}

		$this->EE->db->query($this->EE->db->update_string('exp_members', $data, "member_id = '".$this->EE->session->userdata('member_id')."'"));

		/** -------------------------------------
		/**  Update comments if screen name has changed
		/** -------------------------------------*/
		if ($query->row('screen_name')  != $_POST['screen_name'])
		{
			$this->EE->db->query($this->EE->db->update_string('exp_comments', array('name' => $_POST['screen_name']), "author_id = '".$this->EE->session->userdata('member_id')."'"));

			$this->EE->session->userdata['screen_name'] = stripslashes($_POST['screen_name']);
		}

		/** -------------------------------------
		/**  Success message
		/** -------------------------------------*/
		return $this->_var_swap($this->_load_element('success'),
								array(
										'lang:heading'	=>	$this->EE->lang->line('username_and_password'),
										'lang:message'	=>	$this->EE->lang->line('mbr_settings_updated').$pw_change
									 )
							);
	}


// ------ many more lines below this ---------

?>