Easy: outside of POV, F12 goes to the first character's POV, being on a character's POV, F12 goes to the next one, if the character is the last on the list, you get out of the POV mode. Alternative method: having another key to get out of POV, and F12 just enters and goes to the next one, when the last one is reached, F12 goes to the first.
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Alternative method: having another key to get out of POV, and F12 just enters and goes to the next one, when the last one is reached, F12 goes to the first.
This may need to wait until YL2, but I don't think it would be a huge task to implement.