Nope, it is all up to the user. I too don't put my finger on the F & J key and I still can type without looking at the keyboard. Best of all, nearly 1/4 of the alphabet button on my keyboard is blank (the paint had wear off). The more you practice, the more comfortable and confident you will get. After some time, you will develop your own way to remember each key. It is just like driving a car, your body will automatically remember what to do next. My speed is 55~60 words per minutes with 98% accuracy (Mavis Beacon Teaches Typing test result).

It is the same on Qwerty keyboard. At first it is hell freaking hard but once your body recognize the position of the button after some practices, sap sap water already . I'm now enjoying Qwerty keyboard on my 5800 more then the conventional Alphanumeric method. I type so fast until the phone cannot respond to my speed, especially when I press 2 button so quickly it only recognize 1 letter (well the phone is not multi touch so I can't do much about it ). At the end I have to slow down and it is spoiling my fun (nokia fast fast come out multi touch phone ).

So my advise is practice more with your own personal method . Qwerty keyboard ROCKS .