This is like a jumping board to many of the other tables. I suggest that one not mess with it too much. It is better to mod the tables that this table depends on.
I've modded this table primarily to add more "anti-empire" and "anti_empire_player_penalised" rivalry components to each faction. This should keep the enemies coming if you're an empire and should make life easier for smaller factions early on.
Note that raising "military aggressiveness policy" doesn't change behavior from I can tell. It just causes the ai to say "aggressive" in their profile description.