Yes, I second the request for an option compare several photos in same view, especially when dealing with non-consecutive pics. To be able to choose up to 4 or 6 photos and compare them with 100% view really would be helpful.
And this has nothing to do with ‘overloading’ a raw converter.
BTW, FastRawViewer can only handle single pictures, while ON1 Photo Raw 2020 can do it easily and also without the need to import. Same does LR 5 after import (I’m still on that old version) and within a collection, one can even arrange pics by drag and drop, sort of light table.
Wolfgang