The San Francisco 49ers have signed kick and punt returner Allen Rossum to a 1-year deal.  Rossum returned 38 kickoffs for 885 yards (23.3 avg) with 1 TD return (a 98-yarder).  He also returned 36 punts for 232 yards (6.4 avg) and he had s tackles.  Rossum has now played in 140 games in his NFL career and he has 157 tackles, has defensed 14 passes, 2 interceptions and 2 sacks.  Rossum has made his money on returns not his defensive ability over his career.  Rossum has returned 459 kickoffs for 10,520 yards (22.9 avg) with 4 TD returns.  He also has returned 280 punts for 2,749 yards (9.8 avg) with 3 TD returns.  The Niners return games were weak last season and Rossum should improve on that for them in 2008.