There is currently a technical limitation with the animation system we use that prevents us from changing the playback speed of an animation. The next release (due soonish) will use a newer version of both the Unreal Engine and the Morpheme animation system that will lift this restriction, among many others.

Now, I should mention that the next release won't include the ability to change the duration. It's been a busy release cycle for us with a lot of technical shenanigans, so we haven't had time to add many new features. We'd prefer to release something with bug fixes and whatever small improvements we've managed to make and spend the next release cycle working on new features based on the new engine.


So, the tl;dr version... It's coming.