I had similar thoughts on targetting. I was surprised when I first used a sniper rifle "head shot", which appeared to be going for the abdomen.
I plan to see if I can improve the grenade targetting;
-ATM you can roll, or lob: I thought i would see if I could get an arbitrary angle in between, and controllable launch speed too.
I have to finish fixing the to-hit estimate first.
I am very slow (as I trying to learn c and svn at the same time).