2. Add a way to exclude specific subfolders when doing a synchronize. Maybe exclusion file patterns could be specified, so any file or folder matching an exclusion pattern would be excluded.
3. Make the "modification time" and "file size" compare options, the "existing files only" option, and all other synchronization options available from console scripting mode as well as from the GUI. If it can be done from the GUI, it should also be doable from scripting language, and vice-versa, and furthermore, the scripting "help" command and online documentation should say HOW.