A Dev has already commented on this damned topic here:
http://forum.square-enix.com/ffxiv/t...ill-get-banned
Quote Originally Posted by Hvinire View Post
The type of software you are describing in this thread doesn't appear to directly control anything for the FFXIV client, and as such isn't breaking any of the rules. Similar to other programs, 3rd party software is used at your own risk, and we recommend you employ your best judgement when running software not mentioned in the user agreement.
There, Your answer is VPNs are allowed, but its up to you to use it at your own expense and risk.