I have been searching nearly the whole www (i feel like i did) for a solution to set a shorter delay for the iPhone keyboard to show alternative letters after long-pressing any standard letter. While typing quite fast its annoying to wait "1 second" to write one of these (in germany called umlaute). Particularly you often make use of them in the german language.

Im running a 3Gs with iOS 4.3.3, jailbroken and unlocked.