I added this filter for the next release. In the course of that, not only did I make some changes and fix some bugs but also added support for keyframes (simple and advanced). Prior to adding keyframes, I created a small UI framework to support keyframable filters and used that for this filter addition. The framework is intended to take away a lot of the boilerplate JavaScript code to support keyframes that gets copied from one filter to the next. Thank you for the contribution.