They already are part of stylistic sets. So, for example, if you download a combination of 0 and 7 (regardless of which one), there are ss01-ss06 stylistic sets that encode other options in it.
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.
>>neilpa+(OP)
Oh that's good to know. Admittedly I didn't look too hard but I didn't see any indication that the salt tables were populated. Judging by the comments I may not be the only one.