Here's an idea. I'm not that experienced with kismet but if you can have it log to syslog or a file, you can use a tool like swatch to continuously "tail" a file looking for certain data. When it gets a hit or detects some strings/data common to wps attak, swatch can be programmed to do something/run some program or script. This script can parse the log file, obtain the offending mac address, and send some death-packets or add the mac address to a blacklist. Just an example.