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Update: It turns out it’s not my custom keybinding that made this work. Apparently it was already there and just happened to be bound to the same key I was experimenting with. You don’t need to do anything… the tip is really just that Command-Shift-Option-S already is the old Save As behavior. There, saved you some trouble!

If you do want to replace the ⌘⇧S behavior with the old style, just make a Keyboard Shortcut for “Save As…” in System Preferences:

…

At first, I thought I wasn’t going to miss “Save as…” that much. I generally appreciate the method that Mountain Lion uses to create duplicates of files and store them. More and more occasions have arisen where it’s started to bug me, though. I discovered a solution today while looking for something else. It’s probably been mentioned in many prominent places, but I haven’t ever really looked into it. I just found it, and then I blogged it, and then everybody wrote to me to tell me that they already knew it. Standard operating procedure.

All you have to do is create a keybindings file at ~/Library/KeyBindings/DefaultKeyBinding.dict (or add to an existing one). The file should contain:

Save it and restart any open applications and, based on my testing so far, “Save as…” should just work as it always did before. Note that I set the shortcut combination to @~S, which means Command-Option-Shift-s. I didn’t want to conflict with what is accepted default behavior, and just adding the Option key to an existing shortcut is the easiest way for me to remember that it’s the “alternative” behavior.

If this is the first time you’ve seen me babble about KeyBindings, you have some catching up to do.