That would be awsome if he supported it. I personaly own some rutex boards.
It would make his product more flexable and probably get more sales.
personaly I think its a mistake to team up with one servo driver manufacturer no matter how good they are.
Some people will want different packaging (personaly not a fan of little black box technology) and go elsewhere for no other reason. And then there is the specific work envelope of the driver (ie you might want or need a higher current or voltage ).
And Of course the money issue, you might want an ebay find.