As far as I know, all auto Polaroid - either folding, or hard case - the shutter speed is controlled by a combination of the prevailing light & the Light / Dark control only; you cannot influence it. Any other controls, levers, or sliders alter the aperture. For either 'Color', 'B&W', or 'Inside' settings. Usually, the 3000ISO settings use a very small (
f64 or similar aperture), negating the need to focus with close to infinite DoF. For example the 'Inside' setting change the exposure calculation, leaving the widest aperture (
eg:
f9 or 11) for use inside without a flash...
Further insight can be gained by changing the manual controls when looking at the back of the lens. You can see the aperture plates altering accordingly.
Hopefully, that makes sense, and if so you should be able to apply to any auto Polaroid and film setting? With the right understanding, you can tweak various settings, and trick the camera. This photograph for example was taken with ISO3000 film, manually timed in low light (by releasing the shutter manually). Skj.