ARAM re-roll reform

I began playing ARAM to learn a larger variety of champions. It is a useful game mode that only needs minor changes to the re-roll system to stimulate a better team comp as well as revamp strategy. A lot of times I notice "We need poke," or "We have no tank," but am helpless to do anything about it. All I am proposing is that everyone be granted a re-roll at the beginning of every match and if you do not use your re-roll then bank it for 2 re-rolls next game. I have been thinking on the negatives of aram and if these small changes to the re-roll system will achieve a game mode that is taken more seriously and is less likely to rely on luck being the deciding factor of victory. thank you for the game, Buddy