OOTB features, limitations and Customization Options for Field Service

Summary

What are the customization options available for Field Service

Content

I am trying to evaluate Oracle field service cloud for the out of the box functionalities, its limitations and customization options. So far i know following:

Features:

• Activity Setup & Management
• Inventory & Resource setup
• Forecasting
• Routing rules
• Mobile application
• Notifications ability

Customizations :

No real customization option available other than plugin which is just like calling outbound webservice.

Limitations:

• Limited to 04 entities only.
• Cannot define custom entity
• Cannot mention which services items technician is going to deploy on the customer site (e.g. Activity to Service Items relation: 1:M)
• Cannot write script behind custom buttons