NEX shutter and ISO settings?
If one does not like what a camera does in automatic iauto modes, there is always the intelligent photographer ip mode available.
Just set to A or S or P mode and dial in what you want.
Actually, I never use iAuto mode, I'm always using Av mode. It's just a pain to always lower the ISO because it's always tries to keep the shutter speed at 1/60 by increasing the ISO.