Isn't it just sad when legendary Urist Mc axedwarf looses his arm to a goblin commander and cant use his weapon anymore? i think there should be a feature that allows surgeons with a high level of skill the ability to sew freshly severed parts back onto dwarves. if a dwarf looses a part he would (after he is done fighting or nearly dieing of course) attempt to take the limb with him to the hospital zone and request that it be put back on before its too late. smaller parts like fingers can be reattached easily and have a greater chance of becoming useable again than larger things like arms.
another neat idea would be higher experienced surgeons ability to sew other dwarve's body parts to a dwarf if its still fresh. if a surgeon is of a very high level, he can even attempt an organ transplant from a recently deceased body with a fresh organ to saved a damaged one in a living dwarf.
how epic of a story would it be if Urist Mc axedwarf recovered his best friend's arm after a goblin commander strikes him down and gets it sewed onto him where his missing arm was. the goblin siege returns later and near the end of the battle, after a long and epic duel between Urist and the same goblin commander, he strangles the goblin to death with his new arm.
i know dwarf fortress seems to take place a very long time ago and dwarves don't seem like the creatures capable of connecting nerve endings, muscle tissue, etc. but come on, giant poison mist breathing snake ostriches, ferment 10 barrels of wine in a day, digging thousands of feet down to mantle without being crushed under the pressure and cooked in the heat, how? its dwarf fortress. that's how.