A quote from the reply:-
Already done, it is bound to the vpn interface, and we also specify the vpn adapters ip for incoming, so yeah not much else i can do here unless im missing a setting in the ui.
from my previous post:-
i see you included this in your post, ok he does go on about setting the incoming adapter but there is no way to do that, you can only set the incoming address, and if you try and force this by editing the core.conf it simply errors, so i dont know how to achieve this, it must be some hackery of libtorrent probably via itconfig i assume.