Sun, 5 Mar 2006 05:43:01 -0800 Bob Glauber, of Newsday, reports the NFL competition committee is reviewing the league's rule around end-zone celebrations. There is concern among committee members that these celebrations are lasting too long. Players can celebrate as long as it doesn't involve teammates, but the duration may be limited to less than what it is now. Also, there is concern about an increase in taunting incidents that are not called. The committee is also reviewing quarterback hits. There is some feeling among competition committee members that all hits below the knee on quarterbacks should be penalized. Currently, defensive players are not allowed to go directly at a quarterback's knees, but can tackle him below the knees if the defender is coming off a block. The committee is looking again at the horse-collar tackle rule and may tighten it up even more. Finally, as previously reported, the committee is looking at the "down by contact" rule and my allow replays on plays that involve a player being down by contact.