As LHA uses unix argument style, this GUI is working in UNIX argument-spaced mode.
As an example, the "a" (archive) switch is defined as a=Archive/S, where the "Archive" will be shown in the GUI and the "a" will be added to the output template.
Note: The /M multiple list doesn't need to be the first argument. (but it almost everywhere is ,)
Also note: This interface is done with the MIXTURE tooltype. Any argument will be put to the GUI in the order it was defined in the template.