If I go recruit then sharpshooter, which attributes should I increase through dedication and by how much? I'm thinking agility and/or cunning

Assuming the GM would let me have 2 replilimb prosthetics for free (because it makes me vulnerable to ion damage and keeps my character from using his fingerprints to identify himself) should I take them or maybe just say that the hands were badly burned in the explosion and that prevents me from using finger prints... the only advantages the replilimbs would give me is not leaving fingerprints/DNA on stuff that I touch.

Supposing I got hit by ion damage and my hands stopped working until the end of the encounter,... I wouldn't be able to fire a blaster or wield a knife but I could still brawl right? My hands would basically be clubs attached to the end of my forearms...

Or would it be better to say that one hand got blown off and the other one was horribly burned which scarred the fingerprints beyond recognition?

But that seems almost like not enough penalty for not leaving fingerprints DNA on stuff that I touch

I'd put one attribute in each personally. A 4 Agility and a 4 Cunning will be pivotal to a great deal of what you want to do with that guy.

In regards to the ion thing on your arms first they have to know you have them to think to do that. Then they actually have to have one of those to fire. Finally imo the write up on that is somewhat fluffy and geared more towards actual cybernetics that grant enhancements.

I'm not interested in re-arguing the write up (it was epic) but to me it is very clear the limb itself has to be hit by the weapon which feeds right back into they have to know you have them, they have to have the weapon to use, and they have to make the aimed shot to make it happen. Don't sweat that rule, because honestly you can temporarily hamstring someone's regular limb as well with an aimed shot. Short answer, get your fake hands and don't sweat it.

A more Frankenstein approach would be having someone else's hands installed. Think like the scene in Minority Report but with hands instead........"Hello Mr. Yakamoto, welcome back to The Gap...."