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I'm not sure if there is a better place for this thread; if so, I apologize. I also hope there isn't already a way to do what I'm suggesting because then I'd sure feel stupid suggesting it.
That said, I would really like to be able to organize my saved masteries. Especially now since we can save up to twenty sets. I have masteries saved for specific champions and then some templates for generic role archetypes. But I'd like to be able to drag "saved Masteries 4" in front of "saved Masteries 2" and, by doing so, bump each mastery set down a number (i.e.; 2 becomes 3, 3 becomes 4, etc.). This way I can alphabetize my mastery list or move a mastery set, say for a new specific champion jungler, adjacent to my other jungling mastery sets.
I know it's relatively minor and probably obsessive compulsive, but it is something I've always thought would be pretty easy to implement and would clean up the masteries list quite a bit.