You can try to have the script change the permission after it's been uploaded. Try this. Edit changebasic.php, line 388 looks like this:

move_uploaded_file($_FILES['userfile']['tmp_name'], "{$config['UPLOADED_AVATAR_PATH']}/$Picturefile");

Right after that, add this:

chmod("{$config['UPLOADED_AVATAR_PATH']}/$Picturefile",0666);