How do I?: Actions for emitters/renderers

Hi there,

First of all, I love this particle engine, really flexible, good performance and great base features !

I created a flame effect by extending Emitter2D class. In the current architecture, we have Actions that updates the particles of an emitter and Activities that updates the emitter itself.
I would like to know if there is a way to apply a MutualGravity Aciton but on Emitters.
For example we could have Actions that could be attached to a renderer in order to access all emitters in this renderer and add interaction between emitters.