Banning Clark boards, hehe.... probably won't happen :P
Cleong that's basically the idea. It's situational and yes even on our medium sized field you can't always head the machine gun ping. It's toggled on and off both on the firing AND receiving tank, so you can have your own Clark tank ignore it. Right now it's a fun novelty between Clarks and sometimes used in battle as mentioned above. I don't rely on it.
I don't really know what the two-shot 'mode' refers to but it'll get tested out.