I have installed the needle valve on my GOSM and I'm able to hold 150° for 6 hours to dry my jerky.
As for as the wind blowing the flame out, if you will look at the burner assembly you will see there is a wind shield almost all the way around except for the holes in the front of the unit, so if you face the back towards the wind you should be alright, or better yet build a wind break, mine is protected by my patio walls.
I found that if I set the burner on low and then regulated the flame with the needle valve I could extinguish the flame by quickly closing the door, so I smoke with the burner on the high setting and then regulate the flame with my needle valve and a quick closing of the door doesn't extinguish the flame, ...but then I never close the door quickly. I also had to bent the tabs on my side vents and close them to arrive at 150°.
As for producing smoke, it's a real pain and I haven't been too successful, so I'm in the process of building a smoke generator, you living in the States could buy one.
Enjoy you new hobby,