A large number of our client of SDM/CMDB tend to add fields / custom attributes to tables / extension tables. I have personally run into a similar situation where the os_name (attribute in CCA) was not mapped to the server_type (field in SDM) for the "Hardware.Virtual" family. The field server_type does exist for the Hardware.Server family. To fix this problem it would be nice to have the ability in CCA to map fields to custom attributes.
Also as an extension a CCA attribute such as Os_detail isnt mapped to ANY field in the CMDB so the ability to pass across CCA Attributes that a client may feel are beneficial in the CMDB would also be something that would be a GREAT to have.