Couldn't find a suggestion area in the forums but just had a quick one. Remove the option on reporting other players. Even if it is up and working right now, I don't know. But I do know it is being abused by players.
Comments I have seen so far.
1. I'm reporting you because I can.
2. Lets loot, if you take loot on my turn I'm going to report you.
3. You stole my dungeon, I'm reporting you.
4. Stop following me or I'm reporting you. (I really like this one. Not because you are actually following the person but because you are moving in the same direction. Its a 2D game!
The list can go on and I'm sure people could give 100 more reasons.
Remove reporting system in game. Actually make the players take screenshots and provide evidence if they feel like someone is abusing the rules. Giving this type of power to 9 year olds will always fail.