Hi, another window snapping application I've used before called Rectangle offers the ability to snap to one third or two thirds by putting the window to the bottom edge near the bottom left or right corner. It also lets you 'drag' out to a wider two thirds. It's very convenient, and I think it could be implemented into BTT in the same Window Snapping preferences. See below what I'm referring to.
Is this something you'd consider implementing? This is basically the last feature of Rectangle that I miss! I think thirds snapping is super handy and should be an easy default.