I got kind of the same question..
When I draw a sprite and it's too big or small, and then resize it in construct2, the quality get killed. And the same if you change the size of an image im Photoshop. It kills the quality.
What if it was some kind of tool in construct2 that let you make a square and see the size of it. Like when you select something, the blue square don't disaper but freeze instead and you can see how big the square is.
I think this will make it easier to make sprites at the right size.