+1 on more C# modes. And yes they could solve that on the 1Dx as it there is fully digital, so only software and not depending on a dial button with fix choices on top. The display issue could be solved as follow:
That seems logical to me to follow, and is a changement that just would need only a firmware modification.
Sorry, but that's not the case (as I stated above). It's not 'fully digital' as the digits used for the Cn
settings are not the variable 7-segment numerals used for exposure settings, etc. The mode indicators in the VF are dedicated illuminated 'cut-outs' for Av, Tv, M, P, and a C with three separate numerals (1,2,3) under it.
Similarly, the mode display on the top LCD is 'baked in' to the hardware. Only on the main LCD (where images are displayed) could additional settings be shown, but that would obviously lead to confusion.
I do get what you're saying (1+3=4) but it won't happen. The 1-series is all about usability, a kludge like lighting up the C and more than one of the numerals simply won't fly.