I would like to be able to go down the list line by line and decide what to do, then as a last step I say "synchronize" and am happy

This works for all decisions except for deletion of files. I can only say "delete left" or "delete right". When I do this, the files are deleted, the list is build again and all my previous decisions are forgotten.
It would be a lot easier to be able to mark a file for deletion (switch the "<=>" box to "x") instead of having to first work through "all other files" and then go again through the complete list to now delete the selected files.
CU
Mike