I think it is. I haven't dug much into Sierra, but there's no obvious window management options. I remember using BetterTouchTool on Snow Leopard to Mavericks w

I think it is. I haven't dug much into Sierra, but there's no obvious window management options. I remember using BetterTouchTool on Snow Leopard to Mavericks which did the job very well, but I think you're correct in that there's still no native support.