QUOTE (Critias @ Apr 28 2008, 08:12 AM)
SR4 core book, page 149. "Unarmed combat."
The advantages a cyberlimb brings to combat are already factored in with their modifiable stats (increased STR = increased damage), the options for further customization in Augmentation (+1 die per limb is nothing to sneeze at), and the capacity for mounting additional weapons (be they shock knuckles or cyberspurs). In and of themselves, cyberlimbs don't innately change your melee damage, though. Sorry.
There's no specific reference to cyberlimbs on the melee damage/weapon chart, because there's nothing anywhere that should lead you to believe there needs to be one. Similarly, a knee does the same damage as a punch, a forearm strike does the same as a headbutt, a chop does the same as a kick, and an elbow does the same as a palm strike. They all fall under "unarmed," just like a cyberlimb.
Now, if you'd like to house rule it so they match up with some bone lacing or a hardliner glove, you knock yourself out. I can certainly see the logic behind it, and (for once) wouldn't much mind someone instituting that as a house rule (or even seeing it in a shaded "optional rule" box in an official game book). But, right now, as written, they do the default unarmed damage appropriate for the attributes of the limb (if leading with that limb, as per page 335).
Actually, there is...
QUOTE ('Augmentation p. 26-27')
While biotech is essentially augmented flesh and bone, cyber uses well-tested plastic derivatives, polymers and other myomers, ceramics and non-corrosive (as well as nonmagnetic and even non-conductive) alloys, insulated microfiberoptic lines, micro-electronics, microcomputers, micro-optical processors, and microgyroscopes and servos—you can’t get hardier than that.
Now, if a wooden stick does Physical damage, shouldn't something made of high-tech plastics, polymers and alloys also do physical damage?
The only reason to assume cyberlimbs do Stun is because regular limbs do Stun and the book says nothing about cyberlimb damage...
IT doesn't say cyberlimbs do (STR/2)S it says nothing... Absolutely nothing... At all...
Anyway, for easy of play we've just decided cyberlimbs do P with whatever mods you had before...
So Mr. No-ware get a cyberarm and now does (STR/2)P...
And Mr. Titanium-Laced gets a cyberarm and still does the (STR/2+3)P he did before...
Not very realistic, but seems balanced and fair...