Heh. Didn't know it was an enterprise! And yes, it is poorly documented. However, the example code featured at the top of this thread is included in the download, in com/LCM/mariotoo/FlashMX/MarioToo_Demo.as, which is part of the mariotoo.fla project file. Beginner-level knowledge of com paths and either the flash open source software OR the proper flash IDE is definitely recommended if you wish to continue pursuing the use of this API.
Future releases may be better documented, but it is unlikely!
EDIT - Yeah all the source files that you would need are available in both the developer and non-developer downloads for b1.3...the only thing I can think of is that you didn't edit the com path for the mariotoo.fla. If you go into Publish Settings, Actionscript Tab, and click on Actionscript Settings, just set the com path to wherever you unzipped these files to (e.g. C:\Downloads\WiiMoteCrap\), and it should compile and run just fine, and you can dig through the source to see how everything works. Best of luck!