Choice of Y-Up or Y-Down for Tilemaps

Have a choice to select the index / coordinate system on creating document or exporting Tilemaps.

Currently force into Y-Down with Y:0 being Top-Left and Y:Max being bottom right. I know that can be resolved in code but would be nice to have this as a check box upon document creation or exporting.

'Y = YMAX - Y;

Thanks!