You know, I really like the simple ideas. And the simplest idea to make things more fun? Get rid of things that are making it less fun.
1. Dodging. Get rid of this by making Aram an official mode, alongside normals and ranked. Dodging frequency will drop greatly, now that there is a penalty for it. <<< I really don't see why you don't do this. What exactly are the consequences of this? Any feedback at all, any red input on why you think this is a bad idea would be appreciated.
2. AFK'ing. Get rid of this by allowing a join system. Players are allowed to join existing ARAM games, replacing an AFK member after he/she has been gone for five minutes. It can be exploited, but who the hell cares? It's a casual game mode. 4v5's are not fun.