Btw, I can control the shutter cable in ASIAIR Pro via GPIO#21. So, I can control any unsupported camera via the bulb cable. Let me know if you want to add the feature, I can help test the feature.
Shutter on
import time
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(21, GPIO.OUT)
p = GPIO.output(21,True)
Shutter off
import time
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(21, GPIO.OUT)
p = GPIO.output(21, False)