Hi there! Thanks for the feedback and your interest in the engine!
You will be happy to hear that the engine actually supports both of these features natively, with absolutely zero coding required.
For your animated menus, the engine accepts standard image formats, including animated GIFs. You can simply upload a GIF as your main menu background to give your game that dynamic, classic Japanese visual novel feel right from the title screen.
For animated scenes, the engine natively reads video files (like .mp4 or .webm). You can seamlessly use them as scene backgrounds to play your anime-style cutscenes, and they are also fully supported in the unlockable CG Gallery.
Let me know if you have any other questions, and have fun creating your VN!