As of the latest build of TDS, 1.2.2268 you can now send ? bitizens to any level. In fact the game now gives you a pop-up encouraging you to try to unlock scenes, and another pop-up telling you that you will get a buying frenzy for delivering them.
1 Answer
Looks like you can send them to any level then, and they'll buy an item and take a minute off the restock timer as usual. This works to your advantage since you can either send them to a level that needs them or to a level that'll unlock a scene from the character/store combo.
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5Another neat trick, if you want to earn more credit, deliver them to the top level and earn double the tip of that long ride.– David MCommented Dec 13, 2013 at 5:33