If you want to play cheating, then i suggest:
http://www.cheatengine.org/
It's like Action Replay, but totally free.
The AP, HP and XP are of float-Type(standard, when you selected it in the CE)
The Ammo(currently loaded into the Weapon, or Medpack{wee, medpack}) is a simple 2-Byte.
I can't research the Plasma-weapons, is there a way, to get these Researched?(using a NoDVD to save the disc from scratches)