Get all buildTypes in AdminPage Follow

Hi! I'm working on a plugin to set various parameters based on the type of agent selected, and I need to be able to update multiple buildTypes when I change an option so that it will cascade through every BuildType that used that option. 

Is it possible to get RootProject in a BuildFeature or a BaseFormXmlController? Right now I get the BuildType for the individual builds by overriding buildTypePersisted.

Let me know if you have any questions