wp_list_categories set order manually?

Is it possible to do this? In the codex the ‘orderby’ option does not allow manual ordering (only ascending ID, name, count, slug etc).

Here is the code:

<?php wp_list_categories('include=16,17,15&title_li=<h3>' . __('By Content') . '</h3>' ); ?>

This is currently alphabetical since I havent included the ‘orderby’ statement. I want them ordered 17,15,16 but only these 3 cats which are not alphabetical.

Is this possible?