I was reading over your post again and somthing caught my attention. You said something to the effect of if you do something once, then you go back and try it a second time something different happens.
I agree, that is totaly un-realistic. In real life everything happens the exactly the same every time. I mean come-on if I where to throw a can down a dark alley next to someone, I would expect them to move along a preset grid, and do the most predictable thing possible.
Shame on you Tom Clancy for making a diverse game.