We'll have to make a list of the companies that are not on BF now. Not that that's a bad thing, of course.

I'm really curious why it isn't bolt-on (i.e. ISO disc brake pattern). If you're all for a useful product for the customers, why not think before you manufacture it? It's a helluva lot easier to drill a cog, even at home, than to manufacture splined ones. And a certain company called Boone makes some already. And the system is tried and tested, no tool needed for cog changes, I'm guessing the hub would be pretty cheap to make. Basically nick some hub shells from whichever MTB maker and make a 120/42 axle kit for it.