I don't usually have any trouble at all keeping my akorn at temp all day without a temp-controlling device. Sounds like you're overcomplicating it. Get your vents set right and it'll go all day with only a couple minor adjustments. Smoked butts for 10 hours on mine last weekend, no fancy IQ thingy, only touched the vents maybe twice for minor adjustments all day, and it held right in the 250-260 range like an oven. It took me a few tries to learn how to get it to temp and keep it there, but once I did, it is the easiest cooker I've ever had to keep temp on. Usually after I have it where I want it at smoking temps, the bottom and top vents will both be somewhere around .5 to 1. I try to keep the top a little more open than the bottom if I can.
...Half a yard full of crap to cook on like everybody else...
Just a hungry hillbilly lookin for a dead critter to cook
in one throwdown,