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);