Thank you for your post!
beverly made a great suggestion as far as posting this in the Product Ideas Space. For now I am going to move this thread from the FileMaker Community Feedback Space, which is specifically for input on the Community itself, to the Discussions Space where you should receive more views and potentially more advice!
Agree. I've gotten used to cmd+D for "Duplicate" which often throws me off when I'm editing my database definitions. Instead of duplicating the field it changes its format to "Date"! Maybe toss that in with your product idea thread if you create it.
I suppose there may be a workaround (in Advanced, at least) to create a custom shortcut. I did that to make cmd+shift+V open the Value List editor.