Before you start spending the cash on modifications I would suggest you run your smoker "as is" for a while to get past the learning curve. You may find you really don't need tighter controls. If you are going to smoke fresh sausages, bacon or fish, tighter temp controls are needed but if you are going to cook garden variety meats such as butts, briskets, ribs, chicken, etc tight temperature control is not really required.
One other thing to consider is if you modify your new Bradley your warranty is null and void.
I will yield to the pro-modification members suggestions for you.