Thank you very much for sharing your ideas, I appreciate it!
Could it possible to specify that file on the end (or the beginning) of the disk DON'T have to be moved again (with criteria like % or cluster number)
I'm sorry but I do not understand what you are proposing here.
move free space in a defined zone of the disk.
Yes, will be possible in JkDefrag version 4.
with a file containing all those specifications.
Yes, will be possible in JkDefrag version 4. It has a scripting language, and small script files are used instead of the commandline.
the possibility to skip a file while an optimization (optimize ou move), with [ESC] or a button on the preview screen.
It's a nice idea but it's technically not possible. JkDefrag is based on the Microsoft Defragmentation API, and that API does not have a facility to cancel a move.