In my experience, the mixer channels’ audio pots behave more like offsets than attenuators; it’s very difficult then to dial in subtle modulation via CV. I’m guessing that’s why they overload so easily when you modulate with a slope, etc.
As for patch-programming with banana jacks, sure, that’s the 4u Serge way. I’m not sure if you’re implying by extension that R*S and other Euro adaptations of Serge are in some ways less Serge, but I just appreciate them for having perks that my own gear lacks. I like the mental exercises and problem-solving that 4u Serge encourages, but hey, sometimes people just want a switch for something (looking at you, Creature v1 and Gator!) or some additional controls, a la CV attenuation on WaveMults, which appears to be included on some LW panels.