20.48 is a Bryce unit and no, ther eis no way to change it. That makes reference to the squares that you see on your basic plane when you open a blank world in Bryce. You can move objects through incriments for precision using the shift and alt key in combination with the arrow keys and the pageup/down keys. It's one fo those things you just have to get used to.

Because I like to blow $%&# up.

Don't fear the night.  Fear what hunts at night.