We already have the ability to configure what tools are allowed to harvest bonsais, but all of those tools have the same yields. It would be nice to also allow configuration of the yields separately for each tool.

For example:

• Harvesting with shears might yield no logs but have a much better chance of dropping leaves.
• An Ex Nihilo crook could be configured as a tool to get direct silk worm drops.
• The IC2 tree tap (is that still a thing?) could be configured as a tool to get rubber.
• High-end electric tools (chainsaws?) could be configured for increased drop rates.