[arnoldjan]

I am not a programmer, so I can only hope the line is picked up during one of the updates during development.

No, it will never be picked. We are producing the correct output without that line.
Adding the line means are are not producing a valid stream, but but fools some equipment that deliberately disallows DTS passthrough,

Insert the sdcard into windows. Open the config.txt file in the directory that is visible (e.g. with notepad).
At the end of that file insert this line:

Code:

hdmi_audio_config=0x200

Popcornmix, you made my day :-) adding the line did the trick.
Now Dolby as well as DTS work instantly.

On my Windows Kodi box it works without changing the config, so probably the Intel windowsdriver is ...
more intelligent? less picky? But then again, Linux is no Windows