Especially when filling the entire X/Y build area, so there is no room for a brim on the outside. Then it would be good to have the brim on the inside.
A drop-down menu to select where to place (inside, outside, both) would be good. The question is how to deal with non-closed outlines which do not have an inside / outside.
BTW the same applies to the placement of the prime pillar. Being able to freely place it when there is no room outside the model would be great.