Don't worry, I'm pretty sure that any discussion about community would be lost here anyway.
I think you will find people activating things at largely the same points as a normal game, anyhow: i.e. psykers will all get activated first to do their boosts before getting shot, etc. What I meant with the powers was more the other way, i.e. you could get a boost to toughness from your biomancy power but the other guy goes first and shoots you before you can cast it, etc. Makes psykers lose a lot of value, but then again they are super cheap so it makes sense to some degree.
Has anyone actually tried this, by the way? I have, and we found it worked better to keep the phases intact, but I am just curious. Bolt Action's activation has some interesting mechanisms when applied to 40k as well (not tried personally but have heard of others doing it).