Collect All Resources Button
I think it would be a convenient feature to have a collect all button for the resources. That way you don't have to risk accidentally moving walls or buildings around like I do with my fat fingers. You can see this button by clicking/selecting one of your resource collectors. It will have the normal "collect" button, but next to it could be "collect all." You can do this to collect all resources at once or all of the specific resource such as gold and elixir. Just something that I think would be cool to have.