David,
The version that you are running is very old. The IP accounting Im not sure what it does, but the show IP flow, I am almost 99% sure that it has to do with Netflow, which was introduced on the ASA in version 8.2 and higher.
Just looked for the IP accounting and mostlikely, all that you are asking for is implemented on Netflow, here is more info:
https://supportforums.cisco.com/docs/DOC-6114
You can upgrade to 8.2.1 not having to do much of a change, now that you know that you are running an old version, please do not consider to (mind as well) upgrade to the latest version without reading what it first needs to be done. The upgrade to 8.2.1 should not be much of a change.
Mike Rojas
Mike