If the paper.yml ( or paper-global.yml) is edited to allow tnt duping and headless pistons, we can make Tree farms, Tinnel borers and break bedrock in the nether roof. Admittedly, this would also allow rail and carpet duping machines but this is no bad thing as players could easily build rollercoasters and the like. Below is an example of paper.yml as per default.
the "false" changed to "true" allows the above.
allow-permanent-block-break-exploits-readme: This setting controls if players
should be able to break bedrock, end portals and other intended to be permanent
allow-headless-pistons-readme: This setting controls if players should be able