Polymorphism tweaks and balance

[Soleil]

Discord discussion (read starting here if curious) happened about Polymorphism and a lot of people brought up a lot of good points that made me consider if it could use changes, so this thread is to see what people think.

Some stuff people listed as issues:

• It's an instant action. People can run and change very quickly with no downsides.
  
• Effortless radio impersonation. People can sow instant confusion among crew and get innocents arrested or worse.
  
• It's a perfect copy. You are indistinguishable from the real person for the most part, even mutadone doesn't help. People can badmouth others and you'll get all the consequences.
  
• It's permanent. If you silently kill someone and steal their face, nobody will ever know.
  
• It has little to no counterplay. A criminal can instantly change into someone else and their arrest records won't work with Beepsky. Someone who keeps changing will likely be extremely difficult to track.
  
• It's better than changelings, who are all about shapeshifting. They got done dirty with having to aggressively grab someone to get an identity.
  
• It has no cost. The regular version has all the functionality, so stabilized means its free. You can even make it unmutadonable. If we compare it to traitor items, it's a voice changer and better DNA scrambler in one at the loss of nothing.
  
• It's confusing. Newbies will often use it and then be sad when they can't turn back to their original self. 
  

Some of the ideas for balancing that was brought up were:

• Action bar for copying an identity.
  
• Mutadone reverts a person to their original identity
  
• Unempowered Polymorphism is only temporary, requiring Empowered to be permanent
  

What do people think? Is it too strong? Overshadowing changelings? Feel free to suggest balancing or disagree!