Perhaps this could be solved by adding to the sitemap an 'external link' that actually points to the services pages (click on a node in the sitemap and you'll see that as an option in the popup menu). Just add one underneath your services page that points to it. That should then show up in the autonav.

I would have suggested creating an alias in the sitemap, but you can't create an alias directly underneath the page that is aliased I believe.

Is the autonav only showing one particular section of your site (i.e. is it a sidebar nav that shows up in interior pages, showing other pages in that section), or is this the primary site navigation that shows anything and everything?

If the former, I'd just make a custom template and hardcode the link to the parent page at the beginning of the list.

If the latter, I'd probably keep the template html as-is but modify my CSS to make the indenting look like it's in line with the children items.