Personnally I like how the things are now. It is really not a problem and is part of the charm of the job.
For M7S I just talked to my healer and we swapped place.

Also increasing the radius of the dances would make dancer extremely annoying in some content such as deep dungeon.

On the other hand, the fact that the damage repartition of the dances is proximity based (closest ennemy takes 100% damage and others take something like 50%) can be penalizing in some contents such as Quantum 40 where you are forced to attack from the front or the side otherwise your damage output is divided by 2. It would be better if the selected target takes full damage which is the case for other jobs such as Pictomancer.