I had the same problem. And yes, you're right. You just need to recompile and recopy the module to the apache modules folder. If you look around the WO documentation. I cant remember which PDF offhand, and I have to go soon, so I cant hunt it down right now, but somewhere, theres instructions how to compile the WO adaptor for apache and just go thru that stuff and then it should work.
Go to the apple discussion boards (WebObjects) and look for my post regarding this. It has a bit more information.
-tim