Advanced Directory Functions: Compare, Selection & More

[MxxCon]

FlashFXP already does
2.- File Size Comparing
4.- Date/Time Comparing

3.- CRC Comparing
in order to do that you must actualy download given file.
in that case might as well use .sfv or .md5
there might be custom ftp commands which tell server to show crc of a file. but there are no standards for such commands so uniform implementation will be virtualy imposible.
right now you can use raw commands to achive same results.