I wouldn't disagree with you on the nightmare of dependency installation without composer ;)  The question is one of whether we / you want to support those that don't use it and instead install manually (crazy as that may be).

Without the classmap, Zend-only folks would end up relying on PSR-0 autoloading.  But then I guess they could also create their own Zend classmap (there is a tool to do this).

To be honest, I don't mind either way, classmap or no...  I use composer so it doesn't affect me :-D