One thing I want :
In the keyboard, the button that let us "change" our keyboard language (also changing auto-correct at the same time) to change from english to french (example) should also serve to remove auto-correct.
I mean, as much as I want to use auto correct, there is always some situation where its a pain in the ass. I get so angry when the iPhone auto-correct a nickname or an e-mail address.
Wifi, GPS, Syncing, Bluetooth. Is it really worth the RAM and battery drain? I mean, how many times per week are you changing your Wifi or GPS settings? As for Brightness, on the iPad it's in the drawer, but how often are you changing that, either? Enough where you'll sacrifice battery and RAM?
A lot more than you obviously.
Brightness is a pain to change in iOS on the iPhone, and the automatic "adjustment" isn't really useful. Sometime you are in a dark environment, sometime you are outside, you want to be able to ajust it easily with a slider.
About Wi-Fi, the problem is that lots of public wi-fi need some kind of "browser activation" for the device to access internet, and sometime it can take several seconds for the Wi-Fi to set-up. And since the iPhone is set up to use Wi-Fi when it can instead of 3G, i find myself in a lot of situation where i want to check my email, but everything is just "jammed" since the Phone, instead of using 3G is waiting for one Wi-Fi to answer back and activate, sometime this particular Wi-Fi is far and the phone get weak signal, but it still wait for it. So i have to go in the settings to deactivate Wi-Fi because i don't want to waste my time waiting for the public wi-fi to answer and just use the damn 3G.
So yes, I happen to use these a lot.