Hi, this is the best program I have found to help manage duplicates. It would be very helpful if there was a shortcut one could set to rename a file, like f2. I noticed that just in 1.4.7 you switched from using the os's own file renaming capability, which is a great plus because that was very slow.
MD5 has produced false positives for me once so I think a more secure algorithm should be used. Because this can cause the process to take longer, the choice of algorithm can be made optional.
Rename shortcut and a better checksum algorithm
algorithms suggestion, perhaps add a 'more secure, slower' option like this:
first check only file-size (already does
and only procede for size-matches,
second quick checksum comparison (now uses md5) of same-size files,
third slower hash (maybe sha2 or similar, only when the new option is checked) of same-md5 files.
first check only file-size (already does

second quick checksum comparison (now uses md5) of same-size files,
third slower hash (maybe sha2 or similar, only when the new option is checked) of same-md5 files.