Multiple preferred bssid's in host_roaming 1?

[Drew]

According to:
http://hostap.epitest.fi/cgi-bin/viewcvs.cgi/*checkout*/hostap/README?rev=HEAD&content-type=text/plain

When using host_roaming 1, you may set the preferred ap to connect to by 
using:

iwconfig wlan0 ap <bssid>

Is there any way to setup multiple preferred networks, or would this require a feature request?

ie. 
iwconfig wlan0 ap <bssid1> <bssid2> <bssid3>