As a way of reducing the amount of particle systems on an avatar, it would be nice that there is a Behavior script for the Animation Controller that allows for the complete control over a particle system.

Animation Clips have a good amount of control over particle systems but lack specific functions such as duration or even complete modules like the Texture Sheet Animation module.

By adding a behavior script to the animation controller, we can potentially reduce an avatar that is using multiple particle systems for specific animations, such as the Maya avatar using them for anime like emotions, to around 1 to 3 particle systems.