Any way to remap HDMI-CEC buttons?

I have a Samsung TV and I want to use my TV remote to control Shield TV (over HDMI-CEC). This mostly works with one inconvenient problem. Android Back button is mapped to Samsung Exit button. Regular Samsung remotes have Return and Exit buttons and if you are using this remote then it's ok. But higher end Samsung TVs have Samsung smart remote and it only has Return button. The Return button also works as a Exit button if you hold it down for 2 seconds, but that's really inconvenient.

For me it would make a lot more sense if the Android Back button would be mapped to Samsung Return button and if possible then Android Home to Samsung Exit.

I have no idea why or who (Google, Nvidia or Samsung?) mapped the buttons as they are, but it is not usable for me. So is there any chance we can remap HDMI-CEC buttons?

Disabling HDMI-CEC

Hi,

I'm using Snapcast to stream music to my Shield TV. It's plugged via HDMI to an receiver, itself being plugged to a TV via HDMI. When I power off the TV, the AVR stays on (I was able to disable HDMI-CEC on it), but the Shield TV goes to sleep - even if I disabled everything I could that was HDMI-CEC related. Hence, no more music…

Is there any way to completely disable HDMI-CEC on the Shield TV? I can't disable it on my TV.