Manually pointing to the "System" folder when using unpacked server image without installing the suite

I rarely use the suite and never install it the “right way”, choosing to simply unpack the server image by running msiexec /a. Then I have to copy everything from the “System” folder to the “program” folder or add the “System” to my PATH and keep it there. Is there a setting I could add to the fundamental.ini (or some other INI) to make the suite look for all those files under “System” in a specific folder?