Hi Jim,
I did some further investigation. This may expected behavior, but then we need to be more clear on that in our documentation.
From the documentation it seems that the default counter support is added only for ACL rules and not for policy files. For policy files you must configure count action. The command "show access-list counters process snmp" is however only mentioned at the dynamic rules section.
I still suggest to open a SR for clarification on this topic.
The readonly / readwrite option is only available for use on a policy file.
Thanks,
Ron