If anyone asks me, declaring removable devices in allow-hotplug would make more sense, since we'll typically wanna run perform ifup actions upon connecting the device to the computer. In the case of WiFi dongles used as AP, we'll typically wanna load the configuration file defined via the "hostapd /path/to/config" statement in /etc/network/interfaces. Having to declare the devices in auto as a kludge to avoid erratic behavior during bridge setup defeats that purpose.
Martin-Éric
