Some sets do seem to have a tail, when it shouldn't be shown. But I don't believe that we should have a "Tail Toggle".
We're a race with a tail. It is a defining feature of this race. The solution should just be fixing the sets that should logically be hiding our tail.

On the topic of the "ear pockets", it really wouldn't make sense to have a metal helmet, designed to look like it protects your entire head, only to deliberately leave your bare ears flapping in the magic and arrow filled wind.