Hi, author here! When writing this, I was thinking more in the space of procedural character animation and motion graphics than UI animations. That's part of why I want a system with nice parameters, so that I do have the ability to fine tune and tweak the motion to fit the context. My background is in classical animation so it's something I might just keyframe by hand in a non-code context, or in Flash when it's easier to jump back and forth between code and non code. Although I think having it parameterized still can lead to interesting opportunities for variation in procedural animation!