well atm there is no way of creating filled shapes, besides pasting. id like to be able to make filled in shapes on the fly like how you can currently draw lines. the only way to do said things would be to have a polygon option, or have a polygon drawing action.
i find construct's canvas object is very lacking in the feature department, all you can really do is draw lines and paste atm.
the mmf overlay redux (same thing as canvas) is much more advanced, as you can give it N number of points, and then it will create a filled polygon for you. i would really like it if one of the devs made this feature availabe. (it also has a flood fill action) it has line thickness, and ellipse drawing with line thickness, all of these things can very much be used, and should be implemented in the very basic canvas object.
btw Euphronios dont wrry about it