Fisher doesn't want kicking to be an issue, so he just made sure its not. Last year, Anderson was 27 of 31 tries, and made all his extra points. Pretty good by anyone's standards. He also nailed a 46 yarder to beat the Ravens in the playoffs.
Typically, however, if its over 45 yards, then, yes, Fisher will put Hentrich in to kick it. Not all kicks - in fact few - are 50+ yards, so it takes a lot of pressure off a coach if he doesn't have to worry about a kick from 40 and in.
Last year in Minnesota, Tice - on more than one occasion - didn't trust Elling to kick it within the 35 to 40 yard range. How pathetic. And Elling's inconsistancy and Tice's inability to trust him, affected more than one game.
Fisher's a smart coach, and doesn't want to go through that kind of nonsense.