Sorry, there is already a function "Keep the remote directory synchronized", which makes what I'm suggesting unnecessary.
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1) For more effective editing of php scripts it would be useful if on pressing TAB (or Ctrl-TAB) a whole block of selected text would get shifted (currently pressing tab with text selected causes the text to disappear).
2) Line numbers feature in the internal editor.
3) Perform automatic regular backups of selected files and folders from server to local drive.
4) Auto-save of files on switching away from the text editor window (on losing window focus). It could be made as an option in settings.