Custom reactions to prospect metal from ordinary rock are okay. After all, dwarves are supposed to be master metalworkers.
All custom reactions must require fuel or otherwise have a tradeoff, such as massive amounts of hauling or huge inefficiencies. Keeps the peasants busy!
Everyone does every task. (Farming, masonry, carpentry, weaving, mining, etc.)
Only metalworkers, jewelers, and mechanics are allowed to be specialized to individual dwarves.
The first dwarven caravan I will steal. This is a "donation" to get the new fortress off the ground. No other caravans will be stolen from. Except for elves. Elves don't count.
Every dwarf will have an individual room.
Every noble will have a custom room, made out of their favored materials.
Demands will be ignored, royal guards will be double usual compliment, there will be no regular guards.
Nobles will be the only ones allowed to engrave the fortress.
The entire fortress must be engraved and decorated.
All armor, weapons, crafts, and items used by important dwarves will be decorated with multiple things.
Population cap of 100, the rest of the dwarves will grow up in the fortress as natives.
Every dwarf will have a tomb, even if the tomb is empty.
No traps except to guard rarely used tunnels or to catch wild animals for taming and breeding.
Elaborate death machines are okay as long as they are operated entirely by levers. No automation!