If they ever added such a feature, make sure it has to be enabled in the options but, once enabled, the “Salvage All” button does not have a confirmation dialog box, it just instantly carries out the salvage.
That way I can add an extra line item to the stickied Things That Are NOT Bugs thread for every single time someone reports that they accidentally salvaged an important piece of gear and we can have just as much of chuckle as every time someone posts about moving / attacking slowly and we mention that maybe they should read what Stone Gauntlets do.