Grease Pencil Realtime mirror

Hello to all. Currently, I draw character profiles in Clip Studio and use them as reference to model in blender. This requires mirroring while drawing. After fiddling with grease pencil. the only thing keeping me from drawing character sheets in blender is the fact that the mirroring for grease pencil objects doesn't update in real-time, like it would in any drawing program. Since mirroring updates in edit mode, why doesn't the same apply for grease pencil? I understand it's there and it works, but not seeing it happen while I do it really disrupts my workflow, and it shouldn't be that hard to implement.