Skip duplicate file.

When copying a bunch of files from one folder to another on Mac, the popup box will give you three option: Skip, Stop, or Keep Both. Using skip allows you to quickly back up files by just dragging a whole folder and skipping (checking the "use for all" box) ones you already backed up, this way it only copies over new files that need to be saved.

OpenMTP doesn't seem to have an equivalent option, when copying duplicate files it gives you a dialogue box with only "Yes", and "No." to merge and replace them. If you hit yes, it will copy EVERY file and replace it - wasting a ton of time. If you hit "No" it just stops the process and nothing is copied. Since the main usage of a program like this is to either transfer a very large file, or back up lots of small ones as swapping individual files is easier to do over Wi-Fi than wasting time plugging in cables, I think it would be a pretty important addition assuming I didn't just miss the option somewhere.

For instance, I back up my photos from my phone to a hard disk using it. I already have 6000 photos from my SD card backed up, and only need to copy the additional 1000. As is, I have to copy and replace all previous 6000 photos instead of just skipping over them and only copying the 1000 new pictures.