In a rare idle moment, I was speculating how best to handle a hypothetical WAAC inclined gaming buddy tooling up his AtDE gang with riot shields all round. Grenades. Simple, unpredictable and not necessarily effective - but pick an aiming point somewhere behind the smuck (or, indeed, smucks) advancing behind a riot shield and hope for the best. Even better if the rules catered for rocket lanucher and RPG aim points on static objects (walls etc) rather than people. I feel a house rule coming on..