When using the common tab to save my render output, if I choose exr as my file type and then click the "settings", and then tick the "automatically add/remove render elements from render dialog" box - then it respects this on save - i.e. the output is a multichannel exr which includes all of the enabled render elements.
Regardless of whether this tick box is enabled or not and when outputing .cxr, and regardless of whether I save from the common tab or the Scene tab - it saves a multichannel cxr, AND individual cxrs for each element.
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Specs: AMD 1950X, Aorus Gaming 7 x399, 64GB RAM, 1080ti. Win10, Max 2017, Corona 1.7.3