A simple and useful Normal/Specular Map with the option to enable various light sources and change his color, size and position in the gfx. Also with the Normal/Specular map inside the gfx as other animation frame or including in the parameter effects. Something similar to the MMF2 extension but including Specular Map.
Instagram video to get an idea that how will work(I made this days ago):https://instagram.com/p/4HnLpygLy-/
This are the options that the extension have:
In the second option called "Normal Map Tileset(Overlay)" if you press the "Edit" button you put the normal map image you desire to apply to the sprite.
Also you can add various NormalMap inside one like this(only the normals part):
And in the Tileset Width/height parametre say how much Normal Map tiles there. So in this case 4 in the width and 4 in the height. But well i guess can be improved the system to Construct3 to be more easy.
The actual normal maps/2D lighting effects i found on Construct2 are using another image to apply the normal map(So you need to duplicate x2 the number of tiles in the layout and put over the other) and other that does automatically without personalization of the Normal/Specular map with some glitches :S .
Something like this well done can make the games looks very great with the addition of the raycaster shadow/light,etc...