When we speak of something being genetic, it's usually in the sense of a specific gene or small set of genes specifically geared towards a definable behavior. (which would then allow us to say that, for example, "Gene(s) X" codes for "Y" behavior and overrides other behaviors that would conflict with it).
That distinction seems more meaningful to me.
So is there anything that codes for "preferred Ne" for example? Or is Ne actually a set of many variables that collectively contribute to Ne behavior and perhaps can be emulated with VARIOUS sets of gene (to varying degrees), not just one basic set that can be predetermined?