Champion Search Idea

I think a good additive to the game would be the ability to create and champion pool that comes up when you type a certain phrase into the search box. How it works right now currently, many adc summoners for instance will type in marksman while in champion select and all of the marksman champions will come up, or of course you can just type in a single champions name.

What I am suggesting is the ability for players to for instance create a champion pool and call it mid, when in champion select you type mid and all the champions that you added to that pool i.e. the champions you like to play mid will show up. The current system works good but I think it can be expanded on and it seems to me to be something relatively simple to implement.

Some of the current champions are classified in ways that not every player necessarily views them as. For instance, I think most of us would think of Dr. Mundo as a tank, but when you search tank his name doesn't come up. The ability to create your own champion classifications would help prevent confusion when looking for the champion you want to play. I cannot say the number of times that 5 seconds after locking in I realize another champion that would fit my team comp more.

This system I think would make it much more easy for summoners to pick the champion that best suits their team and would inhibit forgetting about a certain favorable champion until its too late.

I'm not sure if this has been talked about before or if there is a reason in which riot has already said they will not implement it, if this is the case could you let me know?