Wi-Fi Security Measure

Yesterday, I attended the Seminar on Protecting Your WiFi Network and Utilization. There were a lot of recommendations on securing WiFi which include using WPA2+AES, change default SSID, stop broadcasting SSID, MAC address filtering, and not to place APs near windows. Strange, no body mentioned stop DHCP allocation on APs and WiFi client must use a static IP address to connect while the network address is difficult to predict like 10.97.77.0/24. Even an attacker finds out the key, without being allocated proper IP address and gateway, the attacker can still not get through the AP to connect through other people's network.