Medical port. We've got the optional rule to "imagine there's a medical port". Now make one, so samurai can heal better.
I agree with the general sentiment around cyberlimbs and wish they were set up in a way that you purchase them to match your attributes, require natural attributes of a certain level to acquire, and let the STR/AGI inside them be further augmented via Muscle Replacement cyberware. More synergy between muscle systems and cyberlimbs would be appreciated and cure longstanding issues. (The fluff around muscle replacement as "vat grown muscles and calcium treatments" should be changed to be more artificial, because that's describing a bioware system and doesn't jibe with augmentation overdrive).
Make cyberlimbs as easy as possible.
+1 to the tin foil hat augment, even if it becomes a manatech solution.
Echolocation ears
Eyes in the back of your head
Drug injectors
Social/cosmetic ware: face plates, along with manufacturing equipment to make them based on video or scan data? face shaping ware?
For NPCs: How about some thought control, a little puppet tech to keep your troops in line, keep them in the meat grinder longer?
More specialized fingertip compartments, smuggling compartments, and skin pockets. Autopicker fingertip compartment is the low hanging fruit here.
I know swappable cyberlimbs were a thing and that's likely to come back right? I really enjoy cyberlimbs and the gadgets they can sport, just keep the bookeeping to a minimum, please don't invent subsystems with their own stats and mods and tests and skills to use.
Also when writing about augments, mention interesting ways they can be hacked: removable limbs popping off the body, for instance.