I appreciate the attempt to make pane location more configurable via keyboard shortcuts (e.g., the splitting horizontally and vertically).
But the more intuitive and better way is to have a shortcut that positions an already opened/focused pane to the left, right, bottom, top (or even corners)–this is common across most OSs and applications. At present, the only way to do this is via click+drag on the mouse. There is no way to do this via the keyboard.