http://setupmac.com/iphone/
There is an easy access to search in iOS, you can either swipe to the right from main home screen or click home button ones from there. The search screen has a a small search field at the top and keyboard at the bottom, but center is just gray nothing that takes more than half of the screen. It is the perfect place for quick preferences. If you start searching, the search results will replace them, and it's totally fine because it means that you got to search screen to search and thus you do not need those preferences, but if you do, you would use them before searching.
This is very easy to add to iOS and it would be so valuable, many geeks would praise iOS again and regular users would love that too.