Chat priority can be set two ways.
While heritage from department deos not require any additional actions from admin except set desirable priorities. Embed code requires additional attribute. Here is example of embed code with priority set to 5. It overrides department priority.
Developing application takes a lot of time. You can support application by donating. There is no company behind this application and it takes away my free time. Every donation matters and does not matter how small it is!