Anyone succeeded in getting 9vx to take its root from a remote
plan9 file server? There is a mail from RSC from 2009 but he
indicates it is untested, I was just wondering if anyone got it
to work and have a command like they could share?
This should be supported in the newest versions of 9vx (either mine, ron's or 0intro's, there's no difference), but not in 0.12. You can use either a plan9.ini file or a command line argument. It's no different from what you'd do from a real terminal. (Read the man page!)
Even if, for any reason, you prefer the old version you may be able to integrate the original patch by BLS. There should be some message by him in this list where he explains how to get it working with local file systems, a remote one shouldn't be very different.