What would you do, if you were allowed to make a platinum difficulty?

Hey guys, just a dumb question that came to my mind. What is your idea of making this game more difficult and not just throw bosses around?
Personally I'd keep the enemy health and shield pools the same and change the mechanics of the game, Like lets say, cerberus or geth racing you for the objective, or stealing your upload (you loose progress if they enter the upload space). Marauders pairing up with nemesises. guardians working in pairs, watching each others back. I hate the turrets, unless you get a thousand experience for killing them, have the bare minimum of turrets........
what are your thoughts????
ZHHK please take note, if ever bioware lets people make mods.

I'd make the enemies tougher and smarter, but i think adding more bosses and enemies isn't really the way to go. Right now its more of ClusterFuck Difficulty, not Platinum Difficulty

Modify current enemy type/behavior.

A few examples:

Cerberus Assault: Allow different weapon loadouts, such as a shotgunner who also has increased chance of throwing grenades, or a pistol user who has a different type of grenade (maybe a flashbang).

Guardian: One with a spiked shield, increased movement speed and a "charge" ability, similar to Krogan heavy melee. "Heavy" Guardian with a much larger shield that uses both hands, has no weapon, other allies can hide behind it when he closes has a "ground slam" melee.

Atlas: Replace Rockets and Rail gun with 2x Gatling style guns, essentially a walking turret, slow turn speed (you can get around it) and long "reload". A version with no rockets but instead a back mounted mortar that lobs numerous grenades.

I could think up stuff like that all day if I wanted to but BioWare doesn't want my help so I'm not taking the time atm .