That is a pretty informative post and I would have appreciated that info. I read through it and there is one thing incorrect, you can't use KeepAlive as True to keep the process running because vmrun is just a launcher, not the process the VM runs as. The VM takes many processes to run.
But it doesn't help me, I already have my VM launching at boot. As I said it runs as root. Somehow when a user logs in and out the VM stops. Sure sounds like its specific to the way Fusion works unless you know of any other processes running as root that behave in that way.
Even if it is an OSX issue....why exactly does that matter? I don't follow. This is a forum for VMware users who want to talk to each other.