So, I've ditched my Apple Airport base-stations and I'm now using Cisco Aironet AIR-AP1252AG-E-K9 access points which are in a different league.

See below a patch to 0.14.4.5229 to add graphic of signal strength/quality for all connected clients. This no longer needs the dodgy MAC/IP lookup table in SQL that you objected to as the Cisco kit has much better SNMP support (the association MIB to be specific).

A table needs to be created in MySQL thus before applying this patch.

create table aironet_clients (device_id SMALLINT, client_ip VARCHAR(18), active CHAR, signal_db SMALLINT, quality_db SMALLINT, radio SMALLINT, ssid VARCHAR(32));

Enjoy,

Steve