Custom Champion Select Tabs

So, I've been playing league since Season 2 now.... When I started, I think there was a little under 100 champions, maybe more, but I didn't have next to any of them. Fast forward to now, and we have a total of 137 champions, soon to be 138 with the introduction of Ornn, and I have EVERY single one of them, including the IP to get Ornn with champion fragments as soon as he gets out.

I love the variety of champions in league to death. I have mastery 7 on a total of 16 Champions, and have tokens to mastery 7 for atleast 10 others. I love expanding my roster more and more to accompany any situation, but as I expand it, I'm running into an issue.

I'm mainly a support main. When you press the support tab in champion select, its shows all of the utility supports, and not necessarily most of the tank supports, meaning I can't look at my entire pool of support champions (I have a very bad memory, and at this point I play so many characters I can't remember every single champion I play), then go through each one, and weigh the pros and cons of each matchup.

I think it would be nice if you could essentially create your own champion select tab or tabs with whatever champions YOU select to put in it. I love the variety of champions, but there's SOME champions that I just won't play because they just aren't my style. It makes sense to be able to make a tab that reduces the clutter of champions that I know I would never play in a match, and rather be able to see just my entire champion roster of characters I actively play and love playing.

If "creating your own tab" doesn't sound good, maybe you could make a tab that instead once you get Mastery 5 on a Champion, it puts them into a separate tab? Might put a little usage to the pretty insignificant mastery system :P (Well, besides being able to BM in matches)