I developed my own fullscreen system with support for multiple aspect ratios that doesn't involve zooming, so it works great with scroll rates and things, especially useful for HUDs and the like.
The example cap file:
It's a very stripped down version of the system I use in my Action RPG, but you can use it as a starting point for your own screen systems. What this shows is how to automatically detect the resolution and decide on a resolution based on it, and then setting the window size to emulate fullscreen. It's not true fullscreen, but the user won't notice it and Construct doesn't hate it like it hates real fullscreen.
Anyway, yea, hope this helps all of you!