Hmm :think:
Personally, I don't see it as a good idea. Mainly because that's something you can technically accomplished by speaking directly with the person, rather than making a thread for people to take on a "puppet" character and played the way you expected them to play (whether or not this is your intention is not the issue, I'm looking at a general sense) and just be confusing at the least. So I think it's not an necessity for this time.
Personally, I don't see it as a good idea. Mainly because that's something you can technically accomplished by speaking directly with the person, rather than making a thread for people to take on a "puppet" character and played the way you expected them to play (whether or not this is your intention is not the issue, I'm looking at a general sense) and just be confusing at the least. So I think it's not an necessity for this time.