DMZ and Disable WAN Access control access to Surf SOHO

Could you add a DMZ (Demilitarized Zone) and the ability to completely disable wan access to the Router Control pages to the Surf SOHO.
DMZ sets a client IP outside of the firewall to receive all traffic. The WAN access is always on, I set it to be enabled only for Ethernet wan port as a temporary work around (I’m using USB for internet).


You can set web admin access to LAN only by going to System>Admin Security: Web Admin Access.

I was looking around for 2 days…and googled it (obviously not good enough with the google). Thanks!