The Gallery, The Writer and The Resturant

I went into Brisbane CBD yesterday with the X-E1. Some strange things happening with Auto ISO settings, a little erratic perhaps? I had the camera set to AUTO 6400 (because you can
) and shooting in AE mode. I can understand the settings used for 'The Gallery' and 'The Writer' but 'The Restaurant' settings seem strange. I would have thought that the shutter speed would go much lower before pushing the ISO up to 800?
I cant find in the Fuji menu, where the user can specify the minimum shutter speed before the ISO is pushed, as you can with the Nikon system.
The Gallery (55mm, 1/30s, f4, ISO 1000)

The Writer (18mm, 1/30s, f3.2, ISO 2500)

The Restaurant (21.4mm, 1/480s, f3.2, ISO800)


I cant find in the Fuji menu, where the user can specify the minimum shutter speed before the ISO is pushed, as you can with the Nikon system.
The Gallery (55mm, 1/30s, f4, ISO 1000)

The Writer (18mm, 1/30s, f3.2, ISO 2500)

The Restaurant (21.4mm, 1/480s, f3.2, ISO800)
