There was an instant mine hack back in the Alpha days, that was ported to Multiplayer in early Beta days. I think it was patched and now can't be updated. Reach hacks, 90% sure will never exist. but with all these hacked clients popping up around the place, never know... /
Its not like hacking CA.
becuase people dont bother, jsut work hard on the sever and youll sure to get admin, most people with a hack like that would just greif.
there is a superpickaxe-area command that deletes all of blocks of the type hit in a radius you set.