Sure, even the penny stove design I use has a simmer ring, which actually works quite well, I've used it at home to cook long simmering foods like steel cut oats and brown rice and stuff. However, at least with the simmer ring I've noticed the stove is a lot more suceptible to wind - not to mention that a lot of the food I can 'cook' with a simmer isn't practially a lot different than the food I can cook FBC style. So for me it just ends up being "fiddlier" than I want to deal with in the field. If I end up really *cooking* it tends to either involve some frying as well (fish) or larger meals for a large group, in which case I think about it briefly and end up throwing the little snow peak stove in my pack with a canister, or in the case of a bigger mob out comes the svea from the winter box