StarDot cameras all have autoiris. But by default, it's disabled. You can enable it inside on the misc tab.
Try to stick with sizes that do 30fps if you're using autoiris. The iris itself was originally designed for CCTV (60fps) back in the olden times. It just bounces super fast in response to average light levels, you can't actually make it stop in a specific position. Running it at lower frame rates requires a bit of calculus. Doesn't work out well below 15fps. Most manufacturers just drive it open in that case, we actually make it work at all frame rates we support.
Images going completely white is likely due to not setting the exposure grid to the areas of interest. That camera will do 1/50,000 exposures, so it doesn't really need to close the iris. Autoiris has a main benefit of improving sharpness a bit, since a closed Iris has greater depth of field. But the truth is, autoiris on most digital cameras is nearly useless, and many IP camera manufacturers just drive them open all the time. Customer's aren't any the wiser because they're not really concerned about whether a tree 30 feet away has the same focus point as one 50 feet away.
There is the issue of dynamic range however, which might be what you're unhappy with. That's always a problem with digital cameras. Some others have a slightly wider dynamic range (like 12 bits max in most cases), but the camera software can't really figure out what to do with the extra range, so stuff gets kind of squashed and odd looking. Middle range foliage flattens and nearly disappears.
I designed one with a true 16 bit single shot range last year, undoubtedly the largest in the industry. I haven't been able to produce an algorithm that takes advantage of it. There's just too much data, and no way to know what a human would have preferred to see. More details in the clouds, or more details in the foliage? Show the sun through the trees, at the expense of details on people's faces?