Would be great if there's an option to export a txt file including at least the render time it took for each files so that you can compare results and optimize render time.
Along with the render time, it would be nice to include render setting used for each images.
Stuff that you see in the render options tab such as CPU core numbers / Max sample / Max time / Samples / Ray bounce / Anti Ailiasing / Shadow / GI / PB / DOF / Caustics would be nice to see.
This is available already as 'metadata'. It's a checkbox you need to click in the render export settings.