I can't think of any reason why you couldn't change the fill factor on the table without any issues, but I've never change the fill factor on a system table before and would like to know if anyone has done this.
we are seeing 70% fragmentation by the afternoon and would like to lower the fill factor by 10% as have some heavy replication going on.
FILLFACTORonly takes effect on a rebuild. – Nick Chammas Sep 16 '11 at 16:38