Summoner spells, balance and ideas

A while ago now Riot nerfed TP, they stated that the reason for doing so was the prevalence of this summoner spell (Sums) especially in pro games. After the laneswap patch and the focus on laning as an important aspect of the game in pro play, and first tower gold beeing really important this spell is really a must have in the top lane. Imagine if this wasnt so.

In my opinion all good game design in strategy and tactical games revolves around MEANINGFUL choices, it doesnt matter if we are talking about a boardgame, a computergame or even card game. Everything you do or dont do in a game is a choice. With this in mind, i feel Riot should attempt to change the way sums a chosen. Here is my idea:

Put the summoner spells into categories and have each summoner only be able to pick one spell from each category. for instance

Mobility: Flash, Ghost (might need a buff), Teleport (might need to go back to old TP) Support: Heal, Exhaust, Clarity Offence: Ignite, Smite, Defence: Cleanse, Barrier

If you did this right, you could even introduce new sums to the game, and provide choices to players. If it was like i stated above everything (almost) would stay the same, except toplane would have to choose between TP and flash. If you did this correctly all lanes would get more meaningful choices i think. What do you guys think could be some sums that is missing in the game? currently some of these are hardly ever used. The way Riot has approached this lately is to have some summoners interact with items ingame (what jungle item and enchant do you get? thats a meaningful choice IMO), i would like to see more of this.

anyways, summoner spell ideas and maybe interactions with items is what would be cool to recieve.