Allow clients to specify the important dynamic range
When clients provide content with a higher dynamic range than the output the compositor has to apply tone mapping. This inevitably looses information. It would be good if the client could specify what part of the dynamic range contains important information to create tone mappings which try to preserve those ranges. The SDR can be used as a fallback when the client doesn't provide this information but there is legitimate reasons for having the important information bellow or over the SDR (e.g. a scene in the night).