a quick little experiment with automator (amyl recommended it, and it is kinda cool!) to use kextload / kextunload to swap between active and passive drivers with a Ralink RT73 USB dongle
ralink's drivers are silly and don't go away when the party's over, which makes kismac feel crowded and sensitive
enjoy and improve
disclaimer: beware, may destroy the entire known universe - check the automator source to feel shiny and safe