Well what about add a CTF (Capture the flag) mode, rules.
2 flags mode:
-The flags are in the base (spawn point) of each faction (storm union vs strike cop) to get the flag you need to go to enemy base take it and bring it to your base.
-Dropped flags (when a player carrying a flag die) should remain in the position where that player died and stay there for 10 seconds, is no one was able to pick up the flag again then it should reset back to the base.
-When a flag is captured the game stop and you get the mission success/fail message and a new round start.
-Lives are unlimited in this mode so the first faction who capture the flag enough times will be the winner (number of rounds should be decided by the host).
-Limited time: to prevent stalemates or grinding there should be a time limit to win the game, the faction who have higher scores (more captures) will win when the time is over, is both factions have the same score then it should be a draw,
amount of time is decided by the host, it can be from 5 to 60 minutes.
Highlight: players who carry the flag should be highlighted in the mini map and you should be able to see them trough the walls (like matrix/heroes)
1 Flag mode
-Rules are similar but this time there is only 1 flag in the center of the map, to win you must take the flag and bring it to the enemy base.