you are right, it can't. vsx-70 looks like it will, along with the 3313ci. I had the 3313ci, loved that feature, but had too many issues with it the first month.
Here is what I am going to do to TRY and use this instead.
Directv to 1x4 switch. one port to AVR, one to TV2.
On TV2, I have a smart TV, so theoretically, I'll have TV, Amazon, and Netflix always on there. The only shortcoming for me is BD player. For that, TV1 would also have to be on BD. I think I can live with that for now.