I can't believe my eyes. I was quitting Max with an unsaved (junk) patcher, up came the "Do you want to save changes?" dialog, I hit Cmd-D instead of clicking "Don't Save," and the button flashed at me!
When did this happen?
I'm ecstatic because I requested this when support for standard Command-Key shortcuts in the Save Changes dialog was first introduced (back in Max 4.something, IMS), and got absolutely zero response. Not flashing buttons in response to a keyboard shortcut seemed so… well, you know…
Let's put it this way: not very Mac-like.
Now suddenly it's there.
(Or is this now automatically being handled by the OS?)