That having said, all customization of current dslrs is a joke given the fact that you've got an embedded computer in your hand. Even on my 25 year old eos620 with date back, I could program in custom shutter-aperture curves!
How did you that?
...btw, the "embedded computer" from our hands is a monster, (especially if we talk about DiGIC 5) with a screen which has 1,040,000 dots. Remember, desktops and after that laptops had for many years a resolution of 1024x768 which means 786,432 dots...
I think that their main problem is that they are locked in pre-iPhone mindset. We have a super-CPU to do just one thing and it can do just in one way. Today the cameras are digital but still built with a mechanical mindset.
Guys, unlock that potential...
It's not the Date Back which has these capabilities it's the Technical Back E (It fits EOS 620, 650,600,RT)
It has never been matched 100% It could program these curves, it could store technical data (shutter, aperture, FL, etc) about as much as 360 shots, it could imprint data on film (there was a small keyboard for that) and ... it could bracket up to nine shots with steps or 1/4th of a stop!