> add an option to disable (lock out) auto source (I tend to switch to it unintentionally).

Sorry, I cant find any reference to "auto source" in the manual, what exactly do you mean ?

> add bit depth and other digital signal input stats to details screen

Bit depth is already in the state overview

> remove or add option to disable dark volume screen, as detail screen has made it redundant.

"Dark Volume / Details" Screen is one screen (manual ch 15.1), why should it go or what do you mean exactly ?

> add icons or some other way to indicate if dsps like crossfeed or eq are enabled on all the screens.

I think there is no room for that on most of the screens and it makes no sense to overload the screens.
Many people operate the unit from distance, tiny icons won't help.
Therefore you get a message window when toggeling some of the settings.

May I ask whether or why you are performing so many changes on your device ?
I am running here with one setup since years for my two devices in the studio and hifi corner.
I have doubts that such a change would be useful.

> add an option for linear volume control aka option to disable volume knob acceleration

If you turn the volume knob slowly, then it is linear. And If you need to turn up or down a bigger range,
then acceleration makes sense and you can listen with your ears when it fits.
Or what is the issue exactly ?

> Add more functionality to bass/treble knobs, they have so much potential and yet are assigned
> to functions I haven't seen any audiophile, let alone pros use.

Sorry, but I don't get your point, what issue you have with B/T knobs ... they do what you expect from them.
What is missing for you ?

> add a “mastering” screen; in my workflow I use a lot of different eqs, mono modes etc. etc.
Could be useful, but have some doubts ... in such a mastering environment I would expect a RME recording interface with TotalMix FX and the ADI-2 Pro as High Quality Monitor / Phones AD/DA converter.
I would perform all these settings in Total Mix FX ...

I get that it is convenient for some people, but it isn't for me that's why I said "option"

>Bit depth is already in the state overview
-It's not displayed in details screen though.

>May I ask whether or why you are performing so many changes on your device ?
I am running here with one setup since years for my two devices in the studio and hifi corner.
I have doubts that such a change would be useful.
-I have large hi-fi speakers, 2 sets of studio monitors and headphone system, all speaker systems have their own room eq and I listen to my mixes with both eq on and off, as well as with headphones with crossfeed on and off. I also deal with a lot of old masters and old and weird machines for reading them.

>If you turn the volume knob slowly, then it is linear. And If you need to turn up or down a bigger range,
then acceleration makes sense and you can listen with your ears when it fits.
Or what is the issue exactly ?
-That's very subjective, it would make more sense to me if I wanted to get 2.5db attenuation I should turn or press vol button 5 times no matter how fast I turned it, I should get 2.5db that's just how my brain works (and some other equipment)

>Sorry, but I don't get your point, what issue you have with B/T knobs ... they do what you expect from them.
What is missing for you ?
-it would be really useful if you could map them to change mono mode, or eq preset, or crossfeed etc.

in such a mastering environment I would expect a RME recording interface with TotalMix FX and the ADI-2 Pro as High Quality Monitor / Phones AD/DA converter.
I would perform all these settings in Total Mix FX
-Due to some older masters I sometimes need to use machines that can't run Total Mix FX or don't have usb port for that matter, and even on my modern machine I have toslink interface card and glass fiber cable that I prefer to use; pc has UPS that would be drained in seconds if class a amps where connected to it, while all audio gear is connected to isolation transformer both for safety reasons and power filtering, and I would prefer to keep those devices galvanically isolated.

Sorry, it was a bad joke: drinking too much coffee so you shake and double-press by mistake on the buttons.

Arf... I really must improve my understanding of English!! Sorry.

Damn it Curt there is a hidden jab at me for using toslink somewhere in there, isn't it LOL