The link you posted is not a "real" lighting engine either, I don't think. If you look carefully parts of the shadows are "banded" which makes me think it's implemented just like the lighting demo in Construct 2, but with more sprites of customised shapes and some more advanced calculations to determine the opacity of each masking sprite. So it's just a more cleverly done version of the overlay lighting effect.
We do plan to introduce WebGL shaders at some point, but these are just effects that run in 2D. They're not going to do much for you beyond the overlay effect Construct 2 already has.