We don't think giving DPs/JCs based on activity is a good idea because it defeats the purpose of donating. A couple of players are very active in the game and it will make such times easily obtainable. It can also mess up with the server economy. Players can easily abuse this by going AFK too, as some players mentioned.
There is an issue with tasks you mentioned aswell. We don't want to reward players for killing others, we promote cop-hunting that way.
We believe it's fine the way it is now, if you have any other suggestions feel free to create a new topic.