I guess they only fix things that are annoying for buyers and ignore what contributors says. Fortunatelly many simple things can be fixed with bookmarklet or browser plugin.
1. No "Check All Checkboxes" on StockXpert
Solution. Check All bookmarklet or CheckBoxMate plug-in for Firefox
2. No multiple image delete on Dreamstime.
Solution. My own bookmarklet which simply deletes all 20 images on current page.