By "set password" do you mean change password or to open FlashFXP with with your current password? 
 
If the later then there is an existing command line option for that 
-pass="<your pass>" 
 
I can add a -lock switch however it would only work in combination with the -tray switch since you can only lock FlashFXP when it's minimized to the tray.
		 
		
		
		
		
		
		
		
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