I think it could be a nice feature, especially before adding new animations to the characters and etc. For an example I have multiple characters that I have already made and would want to export them all into a single folder with the same export parameters, but I still need to go one by one for all of them (which also leads to missing one or two sometimes).
Also, It looks more like another request, but Ideally those sprites could be grouped in folders, that allow to export only certain group. At the same time it may allow to hide some of the sprites from the list, if the group is collapsed.