draggable keyboard?

[jeRrRKKKK]

I was using a symbian phone before i switched to ppc, on the symbian keyboard, i can tab on G, move my finger to F and release, F will be typed instead of G

i cannot do this on the ppc and it's really fustrating as this wouldn't allow for 1 handed typing...

are there any keyboard apps out there that provide such functionality???