Article about 4- and 5-speed Sturmey-Archer hubs kindly shared by John Forester and now on sheldonbrown.com. This dips into the history of the hubs and suggests several useful modifications also applicable to other hubs.
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Five-Speed Hub Gears
http://www.bikerumor.com/2013/10/01/ib13-sturmey-archer-introduces-new-5-speed-hubs-for-2014-adds-new-2-speed-disc-hubs-in-135mm-and-120mm-spacings/