I'm going to give it a shot myself, but is there any particular reason why the plugin is not trying to switch to CSS-powered animations for IE9 and up?
Answering my own question. IE9 doesn't support CSS transitions, and IE10 introduces them without browser-specific prefixes, which means that it should already work for IE10.
Is it possible to support IE9+ in this plugin?
I'm going to give it a shot myself, but is there any particular reason why the plugin is not trying to switch to CSS-powered animations for IE9 and up?