Roku features are supported as described. This is true for any product. A consumer assuming anything else... well, that isn't necessarily supported, regardless of how reasonable such support may seem to the consumer. Devices support what they support. Anything else is a bonus and not to be expected.
As for Beta testing of any such functionality, the Beta testers can't comment on that without violating the Beta agreement. You won't find my name in the current list of Beta testers. Still, I strongly believe that it would be a mistake to assume there's anything related to this is coming soon. As such, if OP requires this functionality of a streaming device, that device isn't Roku. At least, not now, or, in all likelihood, within the store's return window.
Roku Ultra (4660)
Apple TV (5th gen), TiVo, Android TV (MiBox)
Roku boxes from every generation.
Apple TV (2nd, 3rd, 4th gen)