I've added a new tool to the toolset - Quadrangulate.
It will take a triangulated mesh that has obvious quadrangulation history and delete the diagonal edges in order to restore the meshes to their former glory.
This is not a quad remesher, for that look for the Instant Meshes plugin. This is for taking a mesh that was triangulated and converting it back to quads by removing the long edges. It'll be in tomorrow's build.