In the side bar, statuses arranged like: Custom statuses from first added to the last one, then all the template statuses, and then unknown.

Currently, the only way to modify the order of status is possible withing custom statuses' -
Even there, it is an annoying process, if you need to rise any of the statuses up.

So i believe adding arrows to the custom status to easer rearrange their order, would be a nice addition.
Still, it is a rather low priority thing.