You can use cocoa wood exactly as normal wood:
Filling them with milk:
And making cocoa:
Roasting coffee seeds:
Filling mugs with water:
Block and item ID’s and rarity of cocoa trees and coffee plants are now changeable via config file located in .minecraft/config/mod_cocoa. Warning: If you change ID’s of blocks (or items) you already have in your world, the blocks in your world will be replaced/deleted. There is no way to prevent this, so change ID’s with caution!