There would be no harm in it, but I don’t see a pressing need either. Econometrics questions fit in Statistics and Data, while Numerics, Optimization should cover most building blocks in numerical methods economists use. Modeling and Simulation would be a good fit questions about DSGE models, for example.
While some methods are specific to economics, most tools used by economists are very general. On a related note, sometimes fields get stuck with suboptimal methods because of historical reasons, so participating in more general discussions can be advantageous.