Thanks Neil for a great product.
Do you have any plans to add the different variants in as stylistic alternates (SALTn tables)? This is how FontFont encoded two styles of numbers and other various symbols into a single OpenType font. With FF Zwo I like some of the alternates but not others and this lets me choose.
The reason why we have a "font configurator" is because lot of terminals/IDEs/tools/OS, etc haven't got a full support for OpenType features. So we let users configure it as they like and it just works.