All dragons tweaks can be found on this page.
Here are a few different flavors concerning treasures, use ONLY ONE of those:
The default value of a green dragon for the cool down of summoning treasures is 60 min.
Green dragon no cooldown for summoning treasure
Here is the list of 'treasure' you can summon:
"Diamond, Emerald, Ruby, Tanzanite, Aqua, Smoky, Pink, Yellow, Rainbow, Crazy, Gold"
I added those for my alchemist: "Bloodstone, Moonstone, Palladium, Sunstone"
Green dragon summons more treasures
Green dragon summons more treasures without cooldown
Normally you have a 15% chance to get a goldfish.
Along with the added rocks I added more fishes needed by my alchemist:
"Fairy Damsel, Tragic Clownfish, Luminous Salamander, Vampire Fish"
Green dragon summons more treasures and fish
Green dragon summons more treasures and fish without cooldown
Update 15/01/2015: Compatible with patch 1.67