The football rules committee proposed last month to shorten the distance offensive linemen can move forward from the line of scrimmage before a pass is thrown to make it easier for officials to spot violations. The proposed change drew complaints from offensive coaches who have become adept at deceiving defenses by using run blocking on plays that give quarterbacks the option to pass or run. Linebackers and secondary players often key on offensive linemen to determine whether the offense will run or pass. — Instant replay reviews will be allowed to see if a kicking team player blocked the receiving team before the ball traveled 10 yards on onside-kick plays.