When will we be able to edit runes/masteries while in low priority?

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Not sure what you mean by "low priority" but I will assume you're talking about being 3rd/4th/5th pick.

You can edit masteries, but I'd love to be able to edit runes. Don't understand why you can't.

not what I mean i mean the low priority queue that you get stuck in from leaverbuster the 5/10/20 minute wait between each match