Media Sources and Individual User Folders

<?php
	$username = $modx->getUser()->get('username');
	$params=$modx->fromJson($scriptProperties['properties']);
	if($modx->user->isMember('Users')){
		$params['basePath']['value']='users/'.$username.'/';
	 	$params['baseUrl']['value']='users/'.$username.'/';
	}
	$modx->event->output($modx->toJson($params));

<?php
	$username = $modx->getUser()->get('username');
	$newbase='users/'.$username.'/';
	return $newbase;

set the user-setting 'default_media_source' of all users with the primary-group of foo to bar 

<?php
//[[setGroupDefaultSource? &usergroup=`1` &default_source=`3`]]

$c = $modx->newQuery('modUser');
$c->where(array('primary_group'=>$usergroup));

if ($collection = $modx->getCollection('modUser',$c)){
    foreach ($collection as $user){
       $cs = $modx->newQuery('modUserSetting');
       $cs->where(array('key'=>'default_media_source')); 
       if($settings = $user->getMany('UserSettings',$cs)){
           foreach ($settings as $setting){
               $setting->set('value',$default_source);
               $setting->save(); 
           } 
       }else{
           $setting = $modx->newObject('modUserSetting');
           $setting->set('key','default_media_source');
           $setting->set('value',$default_source);
           $settings = array();
           $settings[$setting->get('key')] = $setting;
           $user->addMany($settings);
           $user->save(); 
       } 
    }
}