Fran's an animated guy. Although he doesn't get too high or too low during a course of a season, the highs and lows certainly come during the course of each game.
I believe it to be more of a coaching style than anything. I think it is effective in that his players respond to it.
Would I prefer if he was slightly less animated? In certain circumstances, yes. In others, I feel it is appropriate. Echoing what one of the above posters said, I could do without the destruction of property.
But Fran is an individual, not a robot. If he feels he needs to change to be a better coach, then so be it. If Fran feels he has to change due to outside pressure, I don't think that will have any positive effect on the team's performance.
One thing I would like to commend Fran on is his behavior in front of the media. Many of us would be criticizing the officials, players, and anyone else we could think of after a loss, whereas Fran keeps his composure, gives the other team its due, points the finger at himself, and doesn't criticize officiating or his guys. I think that shows that he really IS in control of his emotions.