This is a work in progress but as it has been requested I am posting it. v2.2.1 is stable, but not all config options are enabled yet.
Now it is possible to breed parrots. Feed them seeds other than wheat and you will get an egg. When you throw the egg there is a configurable chance that it will hatch a parrot. If there is a pair of parrots there is configurable chance of a fertile egg (100% hatch rate). It can be configured that hatched parrots will be tamed, or not, and if they will be named or not.
This plugin does not use spawn eggs, rather you get a regular egg with custom name and lore.
There are plans to add other mobs that are not otherwise tameable or breedable such as Polar Bears. Please use discussion area for questions or feedback. Github issues will be more easily noticed for me though.