there's a lot of more complex paths that could be possible with this. for example, having an object revolve in a circle/ellipse path (without rotation) by having one position track move it back and forth in the x axis with circular in-out easing, and another do the same in the y axis or a coil path by having x axis circular in-out easing with linear motion in the y axis.
though, this would be kind of clunky to understand the coordinates for unless you make it so the coordinate/property numbers are relative to the object's current status (ex: not "move to 20 x and 15 y" but "move +5 in the x axis and +10 in the y axis") while still having a way of checking what those coordinates/properties are at each key...