Anyone who uses keyboard shortcuts know how quick and efficent they are. One glaring omission is the lack of a way to select the "overwrite" option on export. I frequently have to go back and re-export something because of minor mistakes, tweaks, etc. Each time, I have to pick up the mouse to change from "use unique names" to overwrite. Apple typically allows tab through to other options, or the first letter of the command you want.
I think it would be great to add the ability to either customize the dialog to overwrite as a default or at least make the O key work.