It wouldn't have to look THAT shitty, though... Maybe something like this:
It doesn't really take up more space. The scroll bar can still be kept slim, but the sensitive area is wider than it looks so you still can use finger. It can still be as wide as in the sample picture shown, just you don't see it. So, if your finger drags near the scroll bar, it moves the scroll bar, If it's to the left of the scroll bar's senstiive area, it does kinetic scrolling. Acutally, I'm writing a BREW application on LG VX11K with kinetic scrolling and scroll bar for fast scrolling, so I know that will work with finger.