How add ingredient to DIY database?

DIY database category protein ( could have more entries. For example this one ( is vegan and claims to be “complete” and might be a useful alternative to the Whey, Soy, etc. proteins now in the category. Is there a way (other than this) to suggest or add items to the database so they can be easily pulled into a recipe?

No idea. You can easily add a custom ingredient to a specific recipe, and export it to other recipes – that’s how I handle all of my custom ingredients.