OK, here's where we'll continue the discussion on manual kneeling. You can see the previous thread here, which contains every post from the discussion going on on the pre-migration forum. It's a long one.
To help clarify the discussion and kick start the wiki, I'm producing a couple of pages which describe the accuracy and cover mechanics in the game in detail. That should give everyone a framework to work within.
Accuracy calculation, including cover save - http://xenowiki.goldhawkinteractive.com/index.php?title=Accuracy_Calculation
Terrain Objects - http://xenowiki.goldhawkinteractive.com/index.php?title=Terrain_Objects
Cover System - http://xenowiki.goldhawkinteractive.com/index.php?title=Cover_System