Nice to have you on board. Good introduction too. Just forgot to give us your name.
On the 'cool' smoking thing, I have never really heard that term. I think we need to clarify what you mean before we can offer help. There is typically 'hot' and 'cold' smoking. Cold is for fruits, cheese, some meat and sausage work and things like that. It is generally considered 'cold' smoking if you stay under 100F. Most of our smokers have difficulty getting under the 100F threshhold.
So, if you are saying you just want to get down to some lower ranges, say 100F on up to 200F, then you will probably need to insert a needle valve into your line to achieve finer tuning. If you are actually referring to 'Cold' smoking, and want to get under 100F, for specific reasons, then you have some alternatives.
One way is to use your present smoker as a smoke generator. Plumb in a vent to accept a clothes dryer hose. Pipe the smoke from your smoker to a carboard box. Make sure this box is taped up so it doesn't leak, other than a small vent on the top for the smoke to exit. Find or fabricate some kind of shelving or rack system to hold the food, and have at it. Fire up your actual smoker, generate smoke, pipe it to the cardboard box and "Cold" smoke your items. I have done that for years. I think Debi(our beloved mother) has also. Probably some of the others.
Currently I use an old Little Chief Smoker. I pipe the smoke to a gutted Big Chief Smoker. I kept cutting the length of the dryer hose down until I got it to the (approx) 90f range, depending on outside temps etc.
Now I use the Little Chief directly for Salmon and other fish. I use the same Little Chief smoker, with the hose plugged in to feed my cold smoker.
There are many other approaches to this, but these are a couple about which I have first hand knowledge.
Hope this helps. If you would like to discuss further, my e-mail is in my profile or you can PM me.
PS Roll Call is meant for introductions and welcomes. I think I have abused that with this long response. To pursue further we really should go to another Forum.