find the file
"example_actionmaps_for_joystick.xml"
it should be in
C:\Program Files\Electronic Arts\Crytek\Crysis\mwll\mods
Copy and Paste this file to your Crysis profile found in - My Documents\My Games\Crysis\Profiles
You will have to paste to both profiles (if you have another one besides the default Crysis)
ensure you do this in both the default and YOUR PROFILE directory
My Documents\My Games\Crysis\Profiles\default\actionmaps.xml
My Documents\My Games\Crysis\Profiles\JamesTKirk\actionmaps.xml
Finally delete (or rename) your old "actionmaps.xml" and rename the copied "example_actionmaps_for_joystick.xml" to "actionmaps.xml"
worth a try, though this will restore vanilla settings and clobber the changes you made
Good luck
note it may be called default_actionmaps in 0.2.0, can a dev confirm ?