Advanced ftp functions

I have tried several ftp applications, transmit, yummy etc.

I plan to make an update to my site and I would like to know if there is any mac ftp program which supports several ftp functions like the ones described below:

- Rename all files of the remote hosting server, at once (like _old_site_files_filename). Also exclude the renaming of existing folders.

- Add files to folders that already exist, without overwriting/replacing folders themselves, but just adding the new files inside folders. Keep existing folders without replacing them. Some folders have special permissions attached to them, so it would be a mess to replace them because then I would have to set all permissions from the beginning...

I hope there is a solution for these tasks in a mac os x ftp application. I wait your help.