Yes, that's what I meant.
It would probably doable code-wise, but there is a bigger cost UI wise. TreeSheets is somewhat "opinionated" in what kind of layout/drawing options it offers, rather than allowing any kind of style, and there is a cost to losing simplicity by implementing every possible thing.
That said, we currently have 6 layout methods (2x3, 2 determining above or left, and the other 3 determining the style), so extending those 2 to allow below (and maybe even right) wouldn't be so crazy UI wise.. but still, maybe its a cultural bias, so far above or left have been sufficient for 99.99% of uses :)