Good suggestions Giggz (and welcome to the US forums). However, some of the Champions have positive or negative synergies across types. For instance, if we made Twitch and Shaco free the same week, it would be stealth-city. Or what about Ryze, Morgana, Blitzcrank and Malphite - that would be stun-ville (but they're all different types). That could happen coincidentally if we used lists of types, so I like the personally-tweaked rotations rather than automatic (and then we can listen to player requests). It also ensures that we have enough easy Champions in the rotations - our #1 goal.