Hi
There is already command line support, however not in a way to automatically import dives. To automatically launch the last used import dialog, you can either right click the taskbar shortcut and select "Import":

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Or you can use these command line arguments (which is like clicking the shortcut item):
Available Task Commands: "Import", "Download", "Logbook", "Statistics", "Equipment", "Settings"
I think automatically importing X number of dives should be possible, however you would have to dynamically adjust the number for each import or Diving Log would have to auto detect new dives (which is certainly possible).