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I would give us a tail like a monkey.
The reason.....
It would be because it is like an extra set of hands it could hold are drink while we do other things or for just hanging around(pun intended).
As I said in the OP I would give us regenerative powers like a lizard. If you have ever met an amputee you understand why.
Definitely limb regeneration for obvious reasons. This thing can regrow parts of its brain too: www.sciencedaily.com...
Natural immortality - like elves in lotr. Immortality is a double edged sword, it would suck to be around when the sun explodes, but natural immortality gives you a way out when you've had your time.
en.wikipedia.org...
I'd give us the ability to disable our sensory neurones for a period. I know I'm cold, body, stop shivering, I get it!
Dolphin sonar - they can see inside animals and attack their vital organs without having ever encountered the enemy before, they can stun smaller fish with concentrated sonar blasts.
My changes don't actually change our physical appearance. I would have said wings, but then, we'd end up extinct - why would we bother with medicine, science or sex when we can be outside flying?