Suggestion: Rune Pages
I saw a post from Riot about the "pre-game" aspect of League, and while I know they probably already have a direction they are headed, I wanted to restate my suggestion from when I first started playing in 2014.
Currently, you have a limited number of rune pages that you cannot alter in champion select. This is a terrible, terrible way to do things, and the designer of the current system should be fired if they have not already been. I believe that each champion should have a unique rune page that you set up for that specific champion. If you want to have different rune pages for the same champion (AP Warwick and AD Warwick, for instance) you would buy a second rune page, but it would unlock a second rune page for each champion. Starting out you would only have a single rune page, but it would be unique for each champion. Adding more rune pages would add that number of rune pages for each champion.
Additionally, you should be able to change runes around during champion select the same as masteries. There is really no reason to not be able to change runes in champ select, other than an attempt by Riot to force people to pay for more rune pages.