Delay for crate spawns, or maybe a new type of sudden death option: Crate spawnings. I think this could be really interesting to a scheme. Early game without crates and only on late game you can find other weapons. This would be good for strategy and could help balancing some schemes. Crates can really help the game end sooner, that's why it could be good to see crates start spawning on Sudden Death, Either 1 crate per turn, or multiple crates per turn, or even Crate Shower effect.
Example: think on those schemes like Intermediate on caves or Quickdraw when both players are out of ammo for long range weapons, those games that players only darkside and wait for sudden death. Crates could really benefit to the game end sooner and to break those several turns shooting with shotgun on the terrain for nothing (skipping turn). Suddenly a scheme without crates could receive crates on Sudden Death. Suddenly a player could find an Aqua Sheep or a Homing Missile in a crate, to help finishing the enemy. Also with many crates on the map, more explosions can occur.
Scheme designers could set only weapons for sudden death to spawn in crates if this feature is on.
EDIT: Or maybe if a scheme already has crates since the beginning, the number of crates that would spawn after sudden death would increase, it would have the double of the number of crate spawns. It would be really fun to see a sudden death like this, much more interesting than earthquake every turn or mini armageddons every turn. It would be also easier to implement, I believe.