Its a very little thing but it would be very nice in further versions on OS X that like in nearly all os x application the preferences dialog is accesible via cmd+,
Also I have a few issues with the dropdowns on os x:
They open when i press the mouse button, but only stay open while the button is pressed.
As soon as I relase the mous button they close.
They are usable anyway, just keep the mouse pressed and select something but its not very comfortable.