I wrote a script last night that does a simple: up, right, down, left. Ran it for a few thousand games last night -- highest it got was over 10k, and consistently got around 2.5-3k.
I don't really have the issue with comfort as described here, but it does suck that the main source of mass content consumption (the bottom carousel) is mostly blocked by the natural place your thumb would be. Viewing content in full-screen is too slow for something like facebook, of which many of the posts you don't care much about.