Dear Narhil maker of this great mod,
I dont know if you have read this thread, but it seems useful for what I'm about to suggest:
http://www.bay12forums.com/smf/index.php?topic=101538.0Suggestion #1
Consider making a ritual where you can turn Dwarves into Golems or stone dwarves. They would similar to vampires stop gaining skills, gain attributes and be unable to recover any damage in case of stone dwarves or golems. But they would still be able to do the same jobs they did when living. That's one of the discoveries of note from that thread that you can make them turn into a tame pet creature that can still do old jobs.
Perhaps you could even go "Gnome" and make a sort of Dwarf Dreadnought, where the wounded dwarf is added into some elaborate magical life support system. The inner layer would be flesh representing the dwarf but the other layer would be some really hard but not really repairable or recoverable tissue.
The tech or ritual requirements should be difficult to attain of course, perhaps be based on some rare creature drop or some highly unlikely reaction product that's not overly spammable (requires scarce commodity to do).
Suggestion #2
Perhaps add in a hostile monster that by syndrome makes Dwaves posessed and turn on their own kind as a lategame challenge or as a very dangerous random enemy. Sorta just adds tags like [HATES_LIFE] [CRAZED] and so on without really changing the base creature, just kind of making it defect from your faction. Perhaps on a timer so that a particulary valuable dwarf could be saved by avoiding maiming or killing him for the duration.
Suggestion #3
The hypnotizer! Adds a weapon or trap etc that makes enemies friendly to your Civ for a duration, kinda like the reverse of suggestion #2.
Again thanks for your mod.