Originally Posted by wpd
This sounds very much like my first column mode version that moved screens Y first and bumped a screen X when no more Y was possible; you might want to give that a go if you do not have this up and running already yourself. I did add a mode and a button, but it is very elegant indeed to go "column" when in continuous mode + zoom.
Thanks a lot for the feedback. Combining the continous mode and column view is my goal here. I've made the binary and patch available, you may test it out.
I honestly believe your column auto-detection patch is a better approach technically, but I'm worried that from a practical point of view, simpler operations brings better user experience. Gesture is good stuff, but I'm not a big fan of gestures without visual cue.