It certainly would make it easier, that's for sure.

Although I don't know why people think the planet would "have to" appear in the sky all the time during the battle. After all, if the camera POV isn't pointing in the direction of the Endor moon, then it's quite feasible that it won't be pointing in the direction of the planet, either.

What would be quite beautiful, although it's only really feasible if you redo the entire sequence, would be to have the battle take place between the moon and the planet. But that's pretty complex given the material we have to work with.