In some way you are right, but still I think it's even worse to use WEP cause then the admins might think it's safe, it takes about 15 minutes to crack a wepkey, so instead of drive-by spamming you could call it drive-by, have a bagle, start spamming.
WEP != security, true.
The most hardware/software indipendent solution I have seen so far is the use of VPN, simply place the WLAN outside your own LAN.
This would prevent drive-by spamming if combined with a filtering policy that makes the wireless LAN useful only for (authenticated) VPN access and the minimal amount of glue (DHCP, DNS to a specific resolver) required to make the VPN work. If the wireless LAN has access to any host you don't control directly, the risk of there being a conduit to access the wireless LAN in ways that you don't intend goes up. Stephen