Besides borrowing past ideas from Deer&Dino to include in CKS, like:
Stealth weapons bows/xbows (expansion of CKS Knives).
Poison darts, sticky bombs, and all of the other fun gadgets that Dino's "exotic" series weapons offered.
Energy drinks (slowing down time while scope engaged).
Imagine this scenario:
We start with the current lighted version of the base and have the option to blow up the electrical breaker box to turn off lights. We can't see the enemy unless they fire and the accuracy of the machine gun soldiers follows the programming of a defender sniper. We can use/throw flares "equipment" to light up parts of the bases; something to give you that "Aliens" movie feeling. Sound suppressors for our rifles would be cool to introduce more of the 'stealth' aspect and a inferred scope would help the stealth aspect with the 'lights out' scenario. "Predator" style clear water cloaking soldiers would also be kind of cool and/or "Terminator" style liquid metal soldiers that you could only temporarily disable with a rocket or full blast from a Tesla.
iPhone 4, usually.