In reply to Smythson:
I too prefer one of the "spider" type with a pipe to the cylinder rather than one which goes on top, though with a 250g cylinder and one of those plastic things that add feet to the cylinder, you can get pretty stable.
The problem with any gas camping stove is that if you are to turn the gas low enough not to burn, it blows out more easily. Also, pans used camping tend to be thinner and the heat doesn't spread throughout the metal as well as with a thick pan, leading to hot spots. So stirring is probably inevitable.
However, if you use a windshield and a good stove with a wider burner head, which the Mimer has, you will maximise your ability to simmer low. A friend has a Vango "spider" that does seem to simmer well, though I don't know which model. Also think about the pan type, and if you don't need to worry about weight, perhaps use a small kitchen pan instead of a thinner walled camping one.