There are hot keys for scraping scrapping multiple buildings. I just click and hit delete multiple times to clear a section out. There might be one for scrapping everything of a building type, but I might be thinking of the power on/off keys.
The existence of hotkeys or not wasn't really my point obviously there is or will be hotkeys to do just about anything in a RTS game.
I said it psychologically effects the player for a reason.
If your a new player and see this major button near the upgrade button you are going to think "what does this do? Should I be using this mechanic?".
As for why I suggested giving 50% refund by default is also psychological as it doesn't matter to much balance wise if all players get the same benefit or lack thereof.
On the other hand if you at least get something back it makes it feel less of an incorrect move.
Why not 100% refund then? why did I suggested changing the nanotech patent?
This is because there does need to be some penalty for building the wrong industry compared to a player that made the correct decision in the first place.