iPad Keyboard: mode based key augmentation

When using the "add Account..." function in the 'Mail,Contacts, Calendars' section in 'Settings' on an iPad, selecting the address field causes the keyboard to change the labels of the !, and ?. keys, shorten the right '.?123' and space key and add two new keys (_ and -)

I have also seen the Keyboard augment to show a .com key for URLs.

Im guessing you can pass the keyboard a 'url mode' or 'email address mode' type argument, has anyone manipulated开发者_如何学JAVA the keyboard in such a way before and what degree of plasticity is there for actual labels or modes?

There are a number of defined UIKeyboardType's. You must use one of those.