For the sniper rifles, get the no-sway attachment at the cost of less damage. In HC that really doesnt matter but no-sway rifles are way too easy and need a cost/benefit balance. Problem solved.
No you cannot shoot through the ice. The benefit is that you can defrost by hitting it. You no longer need to hit just the player. Catch-22. There were many more complaints about not being able to defrost at a distance. So that took priority. Since the ice shrinks instead of dropping it doesnt take long for it to get small enough that there is no need to shoot through it. Knowing that there is a little bit of protection means you might get more people doing proximity defrosts and you can shoot them as soon as the frozen player vanishes.
Besides, how logical is it that ice freezes players but somehow cant even stop a pea shooter?
edit: The crosshairs were put there for debugging purposes and by default are supposed to be off. Even so some like it, others dont. It can be shut off. Talk to the server admins.