Currently there's is a global sysidcfg template defined on Solaris media level, which covers all Solaris deployments.

It makes sense to have per-host sysidcfg template with ability to define location/environment specific variables, such as:

timezone=
root_password=
name_service=
nfs4_domain=
network_interface=

name_service and network_interface would be the top priority, since they are most commonly used across environments