VPN Policy-Based Routing + Web UI -- Discussion

Is it any way to add custom,(not a VPN) interface?
For example I have

config interface 'tor'
        option ifname 'tor'
        option proto 'static'
        option ipaddr ''
        option netmask ''
        option type 'bridge'

But if i`m adding tor or br-tor in "Supported Interfaces" I can see "TOR" in drop down menu under Policies, but there is an error in system log:
user.notice vpn-policy-routing [7909]: ERROR: Failed to set up 'tor/br-tor/'
And ofcourse nothing works.