@obero, I agree with you that the current situation isn't suitable for driving. But please don't overreact. You have received two licenses for a discounted price after testing the evaluation version. Nobody should be tricked into buying a license if the platform doesn't provide the functionality the person needs. It was your decision, but I understand your concern.
Our main problem with supporting generic rotary encoders is the lack of a standard we can rely on. Regardless of how we would solve it, there will be users who would like to have a different solution (other pins, brightness instead of volume, other hardware, different step size and so on). Right now we are working on important bugfixes and don't have more resources to develop a full-fledged customizable solution to cover all possible cases for sound control. If somebody would come up with a basic solution, we would be happy to integrate it into emteria.OS. BTW: this functionality can probably be added with a new application, there is no need to modify the platform itself. You can probably build it yourself.
@albdom, yes it would be great to support something like your first link. It is already on our todo list, but we have to finish more important tasks first and have a plan of how exactly it could work for everyone.