For the “Mind-Control Device” I would suggest that it means any Gangsters in play to resolve its attack, picking any gangster that isnt being used would be a bit broken and could make the gameplay a bit confusing.
Then for Saint Salty Peter’s Limp Rod:
So it Attacks, players can use cards in their hands to defend and avoid the attack so they dont gain a limp wand. But the issue is, if ALL of your foes allow themselfs to get hit and not avoid, then the next ability triggers if there are 3 or fewer DWT remaining, thus making the whole Limp Wand stack ends up being in each Foes discard pile. So the strategy is, 1 person HAS to avoid the attack in order to save themselves from getting ALL of the limp wands in their discard pile.