The old launcher allowed relative paths, and thus allowed multiple separate installation directories maintained, and also "out of the box" starting in different places.
The new launcher requires you to go through the menu and trigger a second file check (after startup and change) to alter your installation settings.
Allow to change the path and build type to be changed via argument.
Example:
-path:"D:\Starmade\StarmadeDEV" -build:"dev"
this way players can create shortcuts to launch the launcher in a specific setting combination without needing to open the menu for it.