The ability to turn off some senses temporarily

Stop aging at 20

better concentration and more logical thinking.

i hate how i put people into boxes all the time.

plus make them lie for personal gain less.

Change that double helix into a quadruple one for extra redundancy, making it harder for it to gain irreparable damage. Also, make it a loop rather than a straight line so the ends don't get shorter with each replication. And remove that dementia bug that has a greater chance of showing up the longer run time is

Make a full night's sleep like 4 hours or something. As long as our corporate overlords don't take advantage and make it a 12 hour workday.

Would complete immunity to radiation be a small change?

Would it actually be detrimental in the long run?

Pros: No more cancer

Cons: No more natural evolution

I'd like extra thumbs please

If the body couls generate muscle without needing to excersize first that'd be cool. But I guess that's why steroids were invented and those have some side effects

Better repairing, see Deadpool. Cancer, missing limbs, teeth, w/e.

A utility panel with usb ports, hard reset button, xd card slot, s-video port, etc, could be very useful.

Maybe installed on a butt cheek or back of a calf?

In all seriousness, a spinal realignment feature. Something that resets the joints & muscles in your back to factory default.

deleted

Dual opposable thumbs, now we can grab and open the water bottle with one hand!