Answer
Yes, 60 series is able to support ACS in AP mode.
To enable ACS mode, with summit supplicant, need to set "acs= 1" under network setting segment and it will scan first then choose the best channel to run as AP mode.
Here is an example of wpa_supplicant.conf with ACS enable,
# cat /etc/wpa_supplicant_ap.conf
ctrl_interface=/var/run/wpa_supplicant_1
network={
ssid="miles-hotspot"
mode=2
frequency=2412
acs=1
psk="miles123"
proto=RSN
key_mgmt=WPA-PSK
}