[mtha]

I got mine worked out with postusername to show what I want.

build_new_post will call
class_dm_threadpost.php and function verify_userid(&$userid)
this function will set

		if ($return == true)
		{
			if (isset($this->validfields['username']))
			{
				$this->do_set('username', $this->info['user']['username']);
			}
			else if (isset($this->validfields['postusername']))
			{
				$this->do_set('postusername', $this->info['user']['username']);
			}
		}

I try to use a custom field for postusername -> just need to replace it with

		if ($return == true)
		{
			if (isset($this->validfields['username']))
			{
				$this->do_set('username', $this->info['user']['field10']);
			}
			else if (isset($this->validfields['postusername']))
			{
				$this->do_set('postusername', $this->info['user']['field10']);
			}
		}