Greetings.
First off, great game. I actually took a day off from work so I could have more time to play.
I went to check the development page to see what other suggestions have been made already but I gave up after browsing around a little. Maybe that should be my first suggestion: an index for the development page. Does it have a search feature?
But my real suggestion is to add medical professions. I've read a few posts now where people have mentioned that how dwarves heal up is less than ideal, and I tend to agree. I'd like to be able to do more than decide to lock up hopeless cases.
So, my idea is two new skills, surgeon and physician. Dwarf surgeons would amputate mangled limbs, dwarf physicians would be of little practical use in curing anything but their visits to injured dwarves would inspire a positive thought. Possibly visits from either or both types would impact the time spent healing, depending on practitioner skill. Surgury attempted by a dabbler could kill the patient, too. Obviously, getting a limb cut off or undergoing another operation while conscious and without any pain killer beyond alcohol would inspire unhappiness, so the physician balances the surgeon.
Another possibility is prosthetic limbs, which would, you'd think, be made of wood, but given that this is a fantasy game could be forged. Sounds sort of cool. I don't think they should be as effective-- as in better than natural limbs-- as they are in IVAN, if you know that game.
Also, after the dwarven economy starts, dwarves could spend money visiting healers for services physicians and surgeons historically provided-- bloodletting, cupping, tooth removal, etc. I suppose shaving is out in this case. This could be a safer way to raise skill levels.
I suppose this is a good example of what's called bloat, but I was rather taken with the idea. Apologies if there's already a better plan in place to deal with the healing problem.