.
After two weeks of use, I recommend the following minor adjustments to
Knoppix 7.0.4 to handle infrequent Broadcom BCM-4322 wifi connection
interruptions using a b43 wifi driver.

1. Add 'b43' to /etc/modules; and
2. Add 'sudo iwconfig wlan0 rate 54M' to /etc/rc.local,
assuming wlan0 is the wifi device in question.

These adjustments seem to handle my situation adequately.