The pack comes in two parts, one for the default biomes and one for the marine biomes. To make your custom biome compatible, code it like usual but remember to add a file under entities/biomes/ai like the ones included here, replace the codename with yours pretty much.
FOR DESIGNERS USING A CUSTOM SHELL:
Now for people making their own custom shells, usually big design groups doing remakes i shall include all relevant info to allow you to integrate this into your shell.xml
We do this to it:
All edits will be within the "Buy Area" UILayout and its children, pretty much anything i added with the name derp to it, add into your shell, you can easily just replace that UIlayout with my version posted below if you arent doing any major editing to the gui. Remember to also add the adopt1.xml under ui/template to your z2f and add the gamectxt.xml under config to your z2f as well.
This is how the "Buy Area" UILayout should look, (posted in the .txt DL) https://pastebin.pl/view/71cfbd8a