So many posts...
How responsive will this solution be, if i bought the best cables, MCP4161s, and stuff money can buy...
Money aint an issue for me, so obviously im lookin at trying to solve this puzzle 
And W11cE? how fluently will the keyboard/mouse respond on the PS4 with this idea?
I must say im quite impressed with your work...
Lag is not an issue. Completing one loop takes ~260us. So overall lag with this would be 8ms (edge end) + 16ms (DS4) + this. So i quess ~24ms.
I have only used this with MCP4131. With those micromovements are barely within acceptable limits. I will get MCP4151 hopefully tomorrow or friday. With those this should be pretty good.
Im planning on spending the next weekend playing killzone and bf4 with this. That is ofcourse if all goes as planned. Christmas tries to ruin my plans

. Could record gameplay if there was a way.
Nice work, could look cleaner tho
. I wish i could program 
Excuse me? May i ask what is the part that looks dirty?
To all selling requests: I will make a decision when i have spend some time playing with this on PS4 (and MCP4151 installed). I dont do inferior mods. And the last thing i would do is sell that inferior crap.
And that 4
,7k resistor is not needed.