rc.conf - what's the right way to enable hostap mode?

[Hugo Silva]

# ifconfig wlan1 create wlandev ath0 ; ifconfig wlan1 wlanmode hostap
ifconfig: wlanmode: bad value

# ifconfig wlan1 create wlandev ath0 wlanmode hostap
(works)

My question is how to properly achieve this in rc.conf: 
wlans_ath0="wlan0 wlan1" creates the devices, but it seems impossible to 
set them to hostap operation later. (see the first example).

Am I missing something?