I do not mean to derail a useful discussion with people whining about power gamers or what they think of them. My group largely comes from a TT background, they all have college or graduate level education, several of them in math, statistics, physics, or economics. This means that our game style is different (as all games are). I wouldn't have it any other way. You do not have to feel threatened or judgmental about how my group does things, do your game your way, by all means.
I only meant to express that a running list of houserules/clarifications was not something I saw as avoidable (my players enjoy exploring a system and improving it to be honest). GauntZero is correct, we should work towards having the best rules we can under the circumstances before we take them each to our own interpretations of 40k and the storylines we stitch together. That is all.