Ability to enable/disable overrides of a symbol
It would be great if I could programmatically control what overrides can and cannot be used.

I want to be able to manage this:
<img width="245" alt="Screen Shot 2019-05-18 at 12 35 13 PM" src="https://user-images.githubusercontent.com/4199296/57974205-70a68900-7969-11e9-98e0-bc8810ec92e8.png">

