If I pocket the queen and one opponent's C/m in the same shot, what happens?
Pardon the bump but the correct answer is:

Player loses their turn and the queen comes out. Any of the opponents pieces remain pocketed. 

Actually this is hard to pin down. The official rules state that if a player pockets an opponents piece their turn is over. Since they would then not be able to cover the queen must therefore also come out. There seems to be no mention of any due or penalty, nor a specific rule covering this, so the pocketing of an opponents coin ending the turn appears to take precedent. 

However according to Master Of Games website, this would count as a foul, the turn would end and the queen along with a penalty coin would be replaced. The pocketed coins would remain pocketed. The rules laid out on this site differ in many ways from the official ICF rule so take that into consideration.

Both rule sets state the turn ends and the queen is replaced, the only difference being whether or not the penalty is charged.