Enable vectorization across stencil points

[AreWeDreaming]

We are using MAP to solve a data analysis problem in plasma physics. For the MAP problem we usually only have a single point at which we want to differentiate the our function. Hence, so far we parallelized across stencil points rather than over multiple x values.
We would very much like to try this library but without vectorization across stencil points we can only test it for our simplest cases.

Taking a brief look at the code indicates to me that adding vectorization across stencil points might be quite time consuming, so I understand if this is too tall an ask.

Hope you have a nice day!