I already read it before my last post, see the third line from below. I don't know why they did rephrase it for the Shadow Dancer(it's more a mixture of Camouflage and Hide in Plain Sight there, really), but the original Hide in Plain Sight, the version I've been talking about the whole time, doesn't say a word about hiding without cover or concealment. But let's stop this part of the debate, since You've reworded the ability for the Sniper and it now actually says what it does and fits to what you described it should do.

Back to the rest of the class: As [B]jlousivy[B] already pointed out, the deadly aim has more flavor to it if it's made a standard action, not the first shot of a volley. There was something on this topic somewhere in the homebrew section, I'll see if I can find it...