Keep everything already in, add/modify this:

MP&SP:

-Health meter (accurate prediction of how much juice you got left)
-Faster sprint speed (MAXIMUM SPEED)
-Enable sprinting in ALL horizontal plane (forwards/backwards/lateral/all diagonals) when not in Armor or Cloak
-Enable sprinting at no additional energy expense while in Armor mode, albeit a much, much slower sprint. Similar to Crysis 1 for Consoles.
-The Armor-mode slow sprint will be used by default in "standard mode" when no Suit Energy is left, further removing the "paralytic tank" feel of Crysis 2 while keeping things balanced. This is how things worked in Crysis 1 for Consoles.
-Faster default movement speed when not in Armor or Cloak
-Fix laser to how it was in Crysis 1 (it's nearly unusable for hipfiring now, it's only used for the SCAR spread exploit)
-Enable sprinting while reloading (This was also in C1 and C1 for Consoles, and even in Crysis 2 Multiplayer but not Singleplayer! Why?!!)
-Fix the UI bug that causes you to sometimes not switch weapons until you tap the button a second time.

Multiplayer:
-Higher health pool (significantly higher)
-Enable sprinting while receiving damage (being caught off-guard must be disadvantageous, but not Insta-death. You should be able to FIGHT BACK ON EQUAL GROUNDS (other than damage already received while you were off-guard)

Voilà, AWESOME GAME.

You won't do this at your own expense, Crytek. If I had seen any of the avobe in a trailer you'd already have my preorder, and definitely half a million more.