some situations may call for easier management of users' emails. Currently, mibew just tosses the users' entered survey email address as a tmessage string for the operator, but we needed it to help us create profiles for them in our logs. 
1.#######################################################
First, add a column field for their emails in the chatthread control table:
mysql snippet:
	ALTER TABLE `webim`.`chatthread` ADD COLUMN `useremail` VARCHAR(45) NULL  AFTER `userName`;
Chatthread table records the messageid for a user, so we can associate users' emails with their chat dialogue. 
2.#######################################################
Now, we'll add the php to enable saving the users' emails to this new field.  
client.php line 115 replace with:
		$thread = create_thread($groupid,$visitor['name'],$email,$remoteHost, $referrer,$current_locale,$visitor['id'], $userbrowser,$state_loading,$link);
3.#######################################################
leavemessage.php line 138 replace with:
	$thread = create_thread($groupid,$name,$email,$remoteHost,$referrer,$current_locale,$visitor['id'], $userbrowser,$state_left,$link);
we're just adding  the $email string to the functions here. 
4.#######################################################
Now to actually make the function parse this added string:
/libs/chat.php , replace the create_thread() function  with this:
function create_thread($groupid, $username, $email, $remoteHost, $referer, $lang, $userid, $userbrowser, $initialState, $link)
{
	global $mysqlprefix;
	$query = sprintf(
		"insert into ${mysqlprefix}chatthread (userName,useremail,userid,ltoken,remote,referer,lrevision,locale,userAgent,dtmcreated,dtmmodified,istate" . ($groupid ? ",groupid" : "") . ") values " .
		"('%s','%s','%s',%s,'%s','%s',%s,'%s','%s',CURRENT_TIMESTAMP,CURRENT_TIMESTAMP,$initialState" . ($groupid ? ",$groupid" : "") . ")",
		mysql_real_escape_string($username, $link),
		mysql_real_escape_string($email, $link), \\NOTE:  Adding a new line here to define the input string, with small adjustments above to actually insert it. the rest is distro-default. 
		mysql_real_escape_string($userid, $link),
		next_token(),
		mysql_real_escape_string($remoteHost, $link),
		mysql_real_escape_string($referer, $link),
		next_revision($link),
		mysql_real_escape_string($lang, $link),
		mysql_real_escape_string($userbrowser, $link));
	perform_query($query, $link);
	$id = mysql_insert_id($link);
	$newthread = thread_by_id_($id, $link);
	return $newthread;
}
If anyone figures out a quick and clean way  to add the users' email addresses on each row of webim.chatmessage, that would be awesome. I cant seem to get function post_message_ to read the $email string, probably because it doesn't exist anymore by the time the function is called. 
Referring to webim.chatthreads for each message is less than desirable but at least it works.