Hello! Firstly, great implementation of spine to do FFD in JavaScript! This is the only js runtime I've seen that implements it successfully on Canvas. I've used it, along with your Phaser plugin to make a Spine object of my own for Phaser dev.

Was just wondering why you didn't go with tracks / mixes for animations? Is there a particular reason, or did you just not need them for your own purposes? How difficult do you think this would be to add as a feature?