With C3, we are seeing infinite energy when running and an emphasis on stealth.
Assuming it's a three module limit, I'd like it if we had the ability to choose our modules from the same category.
Example: In C2 you cannot have both Mobility Enhance and Rapid fire and say Point of fire enhance, you can have only one of these. My suggestion is to be able to equip these three as your modules.
Basically, we shouldn't be limited to one module per category, but still retain the total module limit.
This might cause a slight disbalance like: Covert Ops, Stealth Enhance and an Energy Transfer-like module, this would make you ultra-stealthy and since in Alpha footage you can shoot from cloak, you will recharge with each kill, ultimately never leaving cloak, but I am sure that this will rarely be the case