In C1, armour was the default mode. In a way for C2 "Power" (a combination of speed and strength modes) is the default mode, as in you had the speed and strength functions on all the time, but when you weren't using them your suit recharged.
Basically Crysis 3 could keep the same control inputs from Crysis 2, but switch Armour and "Power" modes. The controls would work thusly:
Armour mode: Armour is again the default mode like C1 (PC version), when you aren't taking damage your suit recharges. There is no C2 webbing and your suit doesn't shine. There is no slowing of movement. Damage could work either C1 or C2. In this default armour mode you would sprint at a normal (normal human) speed without using energy, also allowing you to sprint (at normal speed) when your suit is out of energy, just like C1.
New Power mode: As far as the control input, this is activated exactly how you would activate armour in C2, with your suit turning a sixy C1 red (optional). It allows you to sprint faster, jump higher, melee harder, throw further just like C1 as if you had both speed and strength activated at once in C1. Just that you would hold jump for a high power jump like C2
Cloak: Activated just like C2, except that you cannot now combine it with power/speed/strength modes.
This would deliver gameplay pretty damn close to C1, while maintaining the simple (console friendly) controls of C2.