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@Rik_Van_Looy
If you're just riding single speed you can also consider a chain tensioner
I've never really ridden single speed, presumably you get away with a bit more slack since it doesn't matter if the lower run of the chain has a bit of give - I've seen freight bikes in china with chains dragging along the ground (being ridden very slowly).... but I guess that whether you're fixed of free, if you're hammering along you'll probably want as much chain tension as you can muster!
If you use a half link you're dealing in steps of a single chain pitch (1/2") on the overall length of the chain - hence you only need to open up a dropout by 0.25" (6mm) max to obtain perfect tension.