Hi Benny,
you do not necessarily need to use the sapadm user, therefore the sso_admin_user_0 parameter mapping. The reason for the lagging of the documentation from HostAgent side is, that all sso users will have sapadm rights (which is desired in the SAP LVM use case), but imposse a problem for some other use cases, e.g. starting hdblcm via SAP HostAgent (where only a sid-adm user is required).
Best regards
Jochen