Ctrl + Backspace
In almost any Windows program (including InDesign) hitting Backspace while pressing Ctrl deletes the word to the left of the cursor., while hitting DEL while pressing Ctrl deletes the word to the right.
With InCopy on Windows, the word to the right is removed no matter if you use DEL or Backspace. This is very irritating and a bit pointless, since Backspace and DEL are just a few cm apart.
Also, I find myself wanting to delete the word to the left of the cursor much more frequently than the word to the right. For me this is a deal breaker: I'm not able to use any software meant for entering text that doesn't delete the word to the left.
I wasn't able to find an option to change this behavior.