Hello !
It seems that the F2 key is not used in Duplicate Cleaner. Very often this function key is used by softwares to a "rename file" function.
I suggest that Duplicate Cleaner provide the same service, to facilitate some sweet manipulations avoiding movements of hands between the keyboard and the mouse.
It's only a suggestion, of course. And on a very easy additive code to the source code by the developpers. Sure it should be appreciated by numbers of users.