Agreed - hopefully an authorized dealer will come forward with some info about it?
Some STBs display transport stream information and others do not. Just depends on if a developer incorporates that feature into the GUI. The majority of users never look at the service information screen, so most developers put very little effort into this display.
The service information screen typically presents the Transport Stream table data associated with the tuned service not the specific post processing requirements. If the service provider defines the PIDs in the tables, then this information is easily displayed. When I developed the micro HD, whenever possible, I added additional service information line items for the hobbyists. Took extra effort, but I was developing for a niche user and incotporated what I would want to know about a service.
Often this service information data display is limited by the SDK, while other OS would not have these limitations. For example, an Android system is easily configured to display stream, deciding and processing information. If you are very interested in service information, then I would recommend a computer with PCI or USB tuner and running software like TSReader.
I am not in front of a system right now, but doesn't the ASL BYU channel have several APIDS? Might just need to select a different audio PID with the audio button? I have never heard of a "ASL Encoding". Could you tell me more about the ASL format?