You should consider to make GUI for imagevue, like any other program, otherwise its aimed only to technical skilled people.
This way it will be user friendly, and all the options will be visible with on/off switches, color picker, import pictures, enter main size, enter thumbnail size, enter number of thumbnails, titles, music ..... etc. There will be no need of searching the .ini file, everything will be in one place, maybe there should be basic and expert settings.