I agree, but it would be nice and helpful if you could undo a copy or a move.
Deleting on unix is also permanent.
Also if you copy over an existing file that is also permanent.
Just the other day a co worker moved an entire folder and by accident it went to his desktop. It took him over a hour to find that. But it there was such a thing as an undo. The program would know what files it had moved in the last transaction and then undo it.
Just saying it would be a very nice feature. He did turn on the "Are your sure!" feature and that is very nice also.
I really do enjoy using your program and I have donated before and may again :).