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I got this in my inbox today:

I have family who's worked in intellectual property (patent prosecution), and have heard many 'a cautionary tale. One thing I've taken away is that everything, everything, can be contested. But things look good from here, especially when he reported a boost in sales

I should also mention, the inclusion of the AB is totally separate from the greater project. I'm much more inclined to use a Teensy, than an Arduino.

And, while I'm posting, I should mention that I've started work on the screen's PCB. And, as it turns out, I messed a few things up in my library (big surprise, right?). The pot the dmg uses is still very widely used today (Radioshack sells them), but I couldn't find a spec for them (that's Radioshack for you). It turns out that pins 1&2 are pre-pot, 2&3 are post-pot, and 5 is ground. Not surprising, right? What I didn't get is that 1&4 are one channel and 2&3 are for the other... There are several other things, this is just the most recent one. I'll update the plots when a final revision of the CPU PCB is made.

Yeah, that's true. But I'm reluctant to update the AB schematic and plot on an account of ethics. (let me explain) (also, the board works under the assumption that you have regulated power, and know what you're doing with wiring the I/O)
I have the current and previous versions of Xiwi's AB kit PCBs in Eagle. He hasn't given the the go-ahead to publish his work, so I've just done a bear-bones version that is mostly just Trash80's schematic, complete with any problems, to avoid any potential conflict with his kit sales.
So, while I now know to add these parts, it was by means of his kit that I know it. I'd rather play it safe than sorry. I'll PM him and see.

The schematic is based off the Xiwi kit I have which uses one.
The AB board I made was intended to work independently from a full development board, while not being particularly fancy. I used through-hole components to make life easier for whoever wants to etch the board. I'm ok with publishing multiple variants of the AB here if there is want of it.
What capacitance should the cap be? I'm no EE guru.

For the ATmega168? I don't know where to start for that. The last AB update was 12/21/12. If we're assuming that someone can flash the IC, they can re-flash it, right? All that would be needed would be to add an IC socket to remove it safely.
But I feel like I'm missing something here.

Scans would be great! Thanks!

I agree with your point of demising returns, and that it's trivial to solder to the pre-pot vs. post-pot. Though, if it is as you say with power being the greater concern, what types of measures could be taken to benefit sound quality at least in theory. You see, I'm kinda starting on making a custom DMG PCB to make the modder's life a bit easier.
Also, also, if you wanted to bypass all that mess next to the amp, you could actually solder to the top leads of Resister 3(L) and 4(R) pretty easily.

Yeah, that's a good article, but I'm talking more about a comparison of audio taken straight off the CPU vs it taken anywhere else.

By the time it gets through the pot, each channel of audio has gone through a capacitor, a resistor, and whatever resistance is left in the pot.
It's ultimately a matter of preference, and won't matter unless you're wanting to record the best possible sound. Generally, the fewer kinks in the pipeline, the purer the sound. The other thing is interference, which would be more of a problem if you pulled audio at the amp (because it'd need to traverse the entire width of the board, past the CPU and over all its video related output), but I digress.
This is all theory coming from me, because I don't have the ability to do a comparison, but it'd be interesting to see.