I started a forum thread about eZWizardBase, it's here: http://ez.no/community/forum/developer/ezwizardbase . Maybe I'll dig a little bit further into the code today because I'll need it too for other purposes (custom modules).
In eZ publish 3.8 you will be able to add your own installation steps for packages. You can read more about it at http://pubsvn.ez.no/nextgen/trunk/doc/features/3.8/packages.txt .
Exporting and importing packages with new packaging system in eZ publish 3.8 is very easy. Just use Setup->Packages, then new export/import and follow wizard step-by-step. On the output you will receive tar gziped eZ publish package which you can install on different eZ publish installation.