If you could ask one thing of camera and gear manufacturers in 2017, what would it be?
Mine would be for proper RAW histograms. Standard on every new camera, added to firmware on every existing camera as an option where feasible. Show the actual unrescaled-for-white-balance channel-by-channel values, and indicate if any channel is clipping (for more than some small fraction of sensels, say 0.1%).
Really, it is nearly 2017. I've been shooting digital for over 15 years. How come this is not absolutely standard across all cameras and all manufacturers by now???
If you want to know how to do it, play with a RED for a while. Goalpost indicators for under and over exposure, clipping traffic lights and either a rescaled for white balance histogram or a pure RAW histogram as you prefer. This should be on every digital camera that shoots RAW.