Idea for bad traits

I had a thought yesterday about a possible way to help survivors who are great except for a bad trait or two. What about if we had an option to re-roll a trait? I'm thinking when you're about to promote them, instead of getting an extra star and new trait, you could spend all those tokens and re-roll a single trait of your choice. It seems like it should only be allowed once per survivor, but hey, it's not my game, lol. Anyone have thoughts or opinions on this?
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I'm moving it to suggestions. Next pays attention to that section because they love suggestions!
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