I only clean out the coop if I want to remove composted material...the longest time I went without cleaning it out was 3 yrs. With good ventilation and the right materials, one should never smell ammonia smell in the coop. Stirring it all the time is not a good way to get the materials to compost as you lose moisture to the bottom layers each time you do that...you'll want it to compost at the bottom, not throughout the mix. The by product of composting is ammonia, so sealing that process into the bottom layers keeps the smell down, the moisture where it does the most good and allows your materials to diminish into true compost. A simple flip, like you'd flip a pancake, of the poop underneath the roosts every other day and add dry material~don't stir it in~on top when it gets too moist on the surface is a good way to manage DL.
I'd not encourage the chickens do dig in it...they will do that anyway...but I'd avoid disturbing the lower layers of the DL, unless you have to, and until it's time to use it on the garden.
Avoid materials that are all the same particle size and shape and that are slow to decompose, like pine shavings or straw. A good mix of various materials seems to do the best job, but leaves seem to compost the best.