Construct is one the greatest IDEs ever seen, however as I move forward with apps I'm feeling increasingly limited by being tied to the canvas and image graphics.
Being able to play with HTML elements like lists would be amazing. Being able to style menus and layouts in CSS would be a god send; actual RWD would make multi-device menus hilariously easy.
There are a few objects that have some of this deeper functionality, buttons for example exist outside of the canvas element.
I'm aware that Construct is by no means a web tool, but I would be willing to pay license fees again to have access to this kind of functionality.