Yes, you are right. Site Definitions and workflows have not been migrated to SPSF 2010.
Site definitions and workflows are the most complex recipes in SPSF. Till now we did not know if anybody is using these recipes and we decided not to migrated them.
But as we know now that you are using them I will migrated them within the next days. :)
Is that OK?
Thank you for using SPSF.