Is there any way to switch the controller layout on Crysis to match Crysis Warhead layout so the left trigger is used for aiming ?

(yes I know keyboard and mouse are far superior blah blah blah - played it that way the first time way back when - want to play through again trying out a 360 controller)

I'm guessing you can use a 3rd party software such as XPadder or Pinnacle Game Studio's which enables you to map any keyboard/mouse key to the controller.

In Crysis/Warhead you cannot change the setup unfortunately

there is a way - just look for xml file with game settings (cant remember name and path atm, but its in same directory where your savegames and profile stored) and edit it, just look carefull hot things written there and you will understand the way how to rebind buttons.
For example i even bound prone (which is not supported by default on 360 controller, which is very odd for me) to left ministick)