I request for the functionality to switch sites to metaSE easily as well, apart from the existing 150+ sites. A simple implementation requirement is, if a query is made for Mathematics SE, it can be ported to Stack Overflow, but it cannot be ported for metaSE if one does not know that Data SE only responds to
meta s*. For a quick test, visit.
As a sidenote, pre-existing queries meant for metaSE (example) do give results as expected, but once ported to X.stackexchange.com the query cannot be ported back to MetaSE with the current methods.
Feature request: Add metaSE on the drop-down while searching with keywords "meta" or "stackexchange". Currently it only works for