This is think is more of a GUI thing... in earlier versions of Gargoyle I used the MAC filtering however I cant find it in the current version (1.5.8).
Typically what I do is set everything in my home to static via the router (DHCP/Static IPs). In this way I can tell if the network is compromised. Of course there is always a loose chance. What Id like to do is have the connected hosts under status display reflect if a device is in the static DHCP list. and if it is have the text show as 'green' vs the standard black.
For the purposes of my home network (@ 28 devices) the complete list should be green text and if anything is using the standard black text it should be investigated.
Just one of those quirky things I though of to simplify tracing things but not really of paramount interest to anyone but me I suppose.