I was over at my DAW and I was reminded that when I zoom vertically on tracks and layers in v8.5 I don't actually click at all.
I just press my pen down on my Wacom tablet (which
is the equivalent of holding down the left mouse key) where the + or - is on the bottom right margin and the zoom just happens until I lift it off to stop the function.
I can stop at any time, and just zoom a little bit, or I can let it zoom all the way so that a single clip fills the screen.
I love that. it works so fast and effortlessly.
In-Out, it goes so fast I'll bet that's why they call it "zoom".
best regards,
mike