I guess the question is; is it worth upgrading to this firmware?
It's impossible to say for certain without further information from BT.
I would suggest that if you're using the new B030SP06 (Aug 2014) release from the repository linked in the first post and not having VPN related issues then probably not.
If you're using anything earlier
including any of the previous B030SP06 releases then yes, you should upgrade to the latest version (B030SP08).
I was confused about the BT Agent because although it's neutered can't it re-enable itself? (There must have been a reason it was completely removed on the previous firmware releases instead of just disabled)?
Thanks for the links
It's very unlikely.
The VLAN used by BTAgent is controlled by the device config. I certainly didn't see any code touching that in BTAgent and I'm sure Asbokid would have mentioned it if he had. His 'anti-corporate paranoia' wouldn't have let him keep quiet about it
I removed BTAgent from some versions of the previous releases because I was asked to. Nothing more sinister than that.
Unfortunately having so many different versions led to some confusion amongst newer members over which one to use and at least one mistake on my part.
Hence my decision to wipe the slate clean and start again.