Dear Toan !
In fact I have a feature request, which probably falls into the release after version 3.
I am a Science teacher in a Senior High School of Greece as a Chemistry graduate and there is a growing interest in producing animations regarding Maths, Physics, Chemistry, Biology etc.
Since Flash technology is being rapidly abandoned, one who would like to create animations should definitely turn to HTML5 now.
I think that there would be an enormous challenge if Saola Animate could incorporate some animation features now present in libraries like matter.js, cannon.js and jsxgraphcore.js to name a few, easing people, who can not code or do not have enough time to code for whatever reason, to the production of high quality scientific animations almost effortlessly.
To my personal opinion this would skyrocket the value of Saola Animate.
Please consider this with your development team !
Looking forward to version 3 !