I've played a number of other roleplaying systems that featured specific limb damage, which gives a more realistic feeling of damage to ones PC. Not only that, it also gives the GM a good way to describe the damage done, along with critical hit tables, that doesn't put the "blame" square on him if a character loses an arm, say. There's a big difference between a PC losing a limb to a rule based cause over GM simply saying "I think you should lose an arm". Damage descriptions also tend to be more watered down when no one knows where you actually got hit.
For a severely rules heavy system like SR it surprises me that there's no limb/locational damage system (does anyone know why?). It seems like a no-brainer for a system like this that features called shots, firearms, narcojects, blades, armor pieces (helmets, vest, longcoats, etc). Especially considering that losing a limb in SR is more of a cool challenge than the debilitating character-ending injury it would be in a fantasy setting. We have cyberlimbs and vat-grown limbs and what not that would simply change a character a bit rather than put them out of the game forever. "Lose an eye? Hey, Mass-Neotech has a 50% special offer on the brand new MassEye3000 this week!"
Has anyone ever house ruled something like this?