Not with the current code, but I don't personally consider that a "dumb" question. It should be, at the very least, up to the developer whether or not the options go back to default. I hereby request a new "feature" for NSIS (Edgewise and Justin take note
OptionsReset ON will make the options jump back to the developer configured defaults if the user selects back.
OptionsReset OFF will let the user-selected options stay if the user backs up to check what they did.