SOLUTION FOR ZOOMING ON COMPUTERS!!!
Ok, I'll try to explain as best I can. Assign the Zoom in/out keys, to whatever you are comfortable with. I use +- on the numpad. Anyway, hold what ever your zoom option is, and it should glitch a bit, and try to connect the track. When It does this, use your mouse, or touchpad, and click somewhere on the screen and then let go of what button your pressing to zoom. You can then drag the mouse around, and zoom in a lot actually, Much more than even if you are using a tablet or the APK.
If it doesn't work the first time. Keep trying. When I do it, to try and make sure I get it every time. I release the mouse button with the key zoom button, but click and hold it right away again. I can zoom in with ease now and make more technical sections. It doesn't work as well zooming out. But just pressing to see the full scale works, hope this helps at least one other person.