Cubic-Bezier Transition

I’m long waiting for a more natural blending transition in FotoMagico like a sinudual-curve. Coming from Wings Platinum I’m used to set up custom blending curves to get smooth blending transitions. One modern way to set up transfer curves is to use cubic-bezier functions with 4 parameters like in css-transition on websites. This is relatively easy to use. See
I would love to see a integration for a custom blending transition or at least a few presets for ease, quad, cubic curves.