Should I be Importing Computers in to SCSM via AD Connector? No.

Computer accounts that appear in AD may not have valid data in SCCM and therefore when the Cireson Asset Management workflows run and Hardware Assets are created from the imported windows computer CI’s the computer accounts that do not have SCCM data are created but do not have valid SCCM inventory data
CIRESON CMDB PORTAL: CUSTOM CONFIGURATION ITEM FORMS

Since the release of v9.x of the Cireson Portal it is now possible to edit Configuration Items just like Work Items. You are even able to sync custom Configuration Items that you may have created for your requirements.Now that it’s possible to edit Configuration Items some people will start to want to customise the form dynamically as well as being able to create custom form layouts.