No update as of yet. I've shot an email off to my account team to see if they can get an update on the PR and see if it's at least on the roadmap for a fix, or has a targeted release.
This particular issue is terribly frustrating since it essentially breaks all monitoring functionality for the boxes, aside from interface throughput. All the goodies you might want to watch are under that jnxBoxAnatomy mib, including the chassis cluster status, and all the other good utilization stuff. I can't understand how something this (seemingly) simple and basic has gone unfixed through so many releases.
As far as a definitive guide, without those MIBS, I don't think one exists. We use nagios for monitoring and from time to time I've written some pretty nasty scripts to log in to the box, issue a show command, and parse out specific values I wanted to watch - terribly inefficient and inelegant, and not something I would use for any extended period of time.
I'll reply back to this thread when I get an update from my account team, hopefully we'll find something useful (fingers crossed for a target of 10.4.....)