I am new to the topic and just wanted to have a quick feedback for my audio settings in Handbrake. I don't have any 5.1 or 7.1 audio equipment, but would like to preserve that audio source while still avoiding audio transcoding all the time. So I thought I could pass through the original surround audio, and add an additional audio source which mixes the surround audio down to 256kbit AAC stereo. Does that make sense? Please see my attached screenshot:
My config (in the bottom there is a screenshot of the available channels)

Thank you and best regards