NVRAM and where hardware features should be specified programmatically

But I suppose with Espruino you can just set it into a variable and hit save(). :)

Yes - there's also the STM32F1Flash module if you want to use some of the left-over space in Espruino's flash (but you have to be careful with that!).

I should implement a module that uses it to 'fake' an EEPROM - I think it's something that Arduino does on the ARM chips that don't have a real EEPROM