Keeping Time has a number of optional command line parameters, which are listed here.
Drag and Drop
You can drag project files on the .exe and they will be opened.
-f <filename>
This will open the given project directly, bypassing the startup settings, so no Autoload will be loaded, nor will the Welcome Center show up.
-intervaltimer
This opens a standalone instance of Keeping Time with just an Interval Timer window.