Yeah, you could download the wireless-tool from the sdk repo and then do "iwconfig wlan0 power off".. i have put it in a while-loop which i turn on when i need wifi.. or i do as you and just update the ap. I think could have with the ps-poll.. but are not sure.
~ $ devel-su -c "/sbin/iwconfig wlan0 power off" Password: Error for wireless request "Set Power Management" (8B2C) : SET failed on device wlan0 ; Operation not permitted. ~ $
Hopefullt they solve it.. have set up a bug on it before.