The APU doesn’t provide useful thrust, only useful hydraulics, which in this case gave the pilot all his control surfaces and the ability to maneuver the plane to the softest, slowest, levelest, and best possible landing.
If you want to read a story about a Jumbo Jet gliding for miles, read about the Gimli Glider at the link.
What an incredible story.
http://en.wikipedia.org/wiki/Gimli_Glider