Vertically accessible 3-finger multi touch windows
Currently you have 6 spaces: 2 desktops and 4 full-screen apps.
You could simulate &quot;vertical spaces&quot; with desktops (you'd end up with 4 desktops and 2 full-screen apps).
So instead of full-screening chrome, just make a new Desktop to house it. Open Chrome on the new Desktop and resize its window to fill the entire available space. Then open outlook on top of it and make outlook's window size the full size of the desktop as well.
Then using three finger swipe up, you can exposé both windows and click the one you want.