Lets Give Every Champ Their Own Mastery Page

Wouldn't it be convenient if we weren't limited to 20 mastery pages, but instead had one for each champion? This way we wouldn't have to change our pages every time we play a champ that doesn't match up to one of those 20, or for those of us that only make masteries for certain roles (myself included) we could have some fine tuning. If you don't care to change your mastery page for different champs, there could be a feature where you copy and paste your pages to other champs.

All of the above would also be awesome for rune pages, but that's probably way less likely to happen with runes pages actually costing us IP/RP at the moment.