Can I create a forest of mortar trees, rooted wherever I feel like managing the lifecycle?

For example, say I have a single-Activity app with a few top-level sections.  One section is "Settings", and it has a complex set of screens it's managing within a container.  At its top level, though, it's just a View.  Can I create and manage a root scope there?  What if I want to also introduce another root elsewhere in the app?