I came across some threads in the Allegorithmic forum that seem to imply that all maps except the diffuse/base are converted into linear. Was this only for the 3D previewer in Substance alone? I attempted to change the output nodes to different types (say base versus roughness), and they still exported out the same way.
So in short, are all exported materials using srgb and you have to set the engine manually to use linear for the appropriate channels? If this is the case, is there a way to change this without adding a linear node before the appropriate outputs though the programs setup for exports.