@Terje
Do you think the following sentence is correct?
(possibly to be included in the section on CinX in the manual)

To recap: all codecs except x265 (hevc) work at whatever bit-depth is
supported, both in decoding and in encoding. x265 on the other hand,
works at all bit-depths in decoding but in encoding only supports
8-bit. To get x265 encoding at 10/12-bit you have to use CinX
(multibit), but lose the ability to do x265 encoding at 8-bit.