Nokia N900

I saw the option for fbreader in preferences scrolling "large Scrollings". When I change it to tap scrolling.

"check on" scroll on finger tap only.

Every time I go back to this menu, it will goes back to "Large scrolling".
Bug ??

Other thing that I am wondering, whether its possible to touch the "left half " side of the screen to go back 1 page, and "touch the "right half of the screen to go to the next 1 page".

or even touch the screen to go up or down the page.

PS: I am still new on fbreader.