Steve,
No VFP 3 does not have DoDefault(). In VFP3 you use the scope resolution operator :: to call the code from an inherited method like this:

Define class foo as parentfoo

Function Init()

parentfoo::init()

*-- your code goes here.

End Func

EndDefine

I believe the keyword NODEFAULT is in VFP3. Not sure where in the docs though.
Look in the QueryUnload() example in the help file I believe I saw it there.

It might also be in the DEFINE CLASS docs.

Thanks
Rod