You can edit config files to have cheat settings >

How to > Locate the difficulty files in your Crysis installation folder (C:\Program Files\Electronic Arts\Crytek\Crysis\Game\Config). These files are called >
diff_easy.cfg
diff_normal.cfg
diff_hard.cfg
diff_bauer.cfg

Make backups of the files before editing to be safe.
Open the file with Notepad or another text editor for difficulty level you are playing. Add the following line or update the setting for the cheat you want to enable and save the file.
g_godMode = 1
i_unlimitedammo = 1 Unlimited Ammo
ai_IgnorePlayer = 1 Enemies Ignore You
i_noweaponlimit = 1 Carry Unlimited Number of Weapons

You can also modify your suit stats >

g_playerHealthValue = 400.0
g_playerSuitArmorModeHealthRegenTime = 0
g_playerSuitArmorModeHealthRegenTimeMoving = 0
g_playerSuitEnergyRechargeDelay = 0
g_playerSuitEnergyRechargeTimeArmor = 0
g_playerSuitEnergyRechargeTimeArmorMoving = 0
g_playerSuitEnergyRechargeTime = 0
g_playerSuitHealthRegenDelay = 0
g_playerSuitHealthRegenTime = 0
g_playerSuitHealthRegenTimeMoving = 0
g_suitArmorHealthValue = 400.0
g_suitCloakEnergyDrainAdjuster = 0
g_suitRecoilEnergyCost = 0
g_suitSpeedEnergyConsumption = 0
g_suitSpeedMult = 2

Keep fraging !!!

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