It seems a bit wrong to me that burning a fish shells or rat or cockroach corpses produces as much ash in the crematorium as burning a log worth of wood. It might be worth changing the "burn vermin" and "burn bodyparts" to consume, say 10 vermin corpses and 10 bodyparts to produce 1 lot of ash bars.
fasquardon
I like the current ratio of vermin/parts to ash. It takes a bit of work to get enough ash, but not too much.
Burn Bodyparts to Ash and Burn Vermin to Ash each only have a 50% chance of creating an ash bar.
You're welcome to change the rate.
If you want to change your current save, edit reaction_masterwork.txt in your save/regionX/raw/objects/ folder. If you want to change for a new world, edit the one in df/raw/objects. Be sure to back up your originals! In reaction_masterwork.txt, find the Crematorium reactions.
[REACTION:MB_DESTROY_CORPSES_002]
[NAME:Burn bodyparts to ash]
[BUILDING:MB_CREMATORIUM:CUSTOM_R]
[REAGENT:A:1:CORPSE:NONE:NONE:NONE][USE_BODY_COMPONENT]
[PRODUCT:50:1:BAR:NO_SUBTYPE:ASH:NO_MATGLOSS][PRODUCT_DIMENSION:150]
[PRODUCT:10:1:BOULDER:NONE:INORGANIC:BACTERIA][PRODUCT_DIMENSION:150]
YESDUST[PRODUCT:100:1:BOULDER:NONE:INORGANIC:SMOKE][PRODUCT_DIMENSION:150]
[SKILL:WOOD_BURNING]
[REACTION:MB_DESTROY_CORPSES_001]
[NAME:Burn vermin to ash]
[BUILDING:MB_CREMATORIUM:CUSTOM_V]
[REAGENT:A:1:REMAINS:NONE:NONE:NONE]
[PRODUCT:50:1:BAR:NO_SUBTYPE:ASH:NO_MATGLOSS][PRODUCT_DIMENSION:150]
[PRODUCT:10:1:BOULDER:NONE:INORGANIC:BACTERIA][PRODUCT_DIMENSION:150]
YESDUST[PRODUCT:100:1:BOULDER:NONE:INORGANIC:SMOKE][PRODUCT_DIMENSION:150]
[SKILL:WOOD_BURNING]
I think you could change REAGENT:A:1 to REAGENT:A:10, but it seems like the gathering up of 10 items would lead to problems like items rotting/decaying during the delay.
Change PRODUCT:50 to PRODUCT:10, to change the output rate to 10% chance of ash bar, or whatever you like.